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African Natural History

versão On-line ISSN 2305-7963
versão impressa ISSN 1816-8396

Afr. nat. history (Online) vol.11  Cape Town  2015

http://dx.doi.org/10.17159/2305-7963/2015/v11n1a2 

Cretaceous faunas from Zululand and Natal, South Africa. The Albian ammonite genus Douvilleiceras de Grossouvre, 1894

 

 

William James KennedyI; Herbert Christian KlingerII

IOxford University Museum of Natural History, Parks Road, Oxford OX1 3PW Department of Earth Sciences, South Parks Road, Oxford OX1 3AN, U.K. E-mail: jim.kennedy@oum.ox.ac.uk
IINatural History Collections Department, Iziko South African Museum, P.O. Box 61, Cape Town, 8000, South Africa, and 6 du Toit Street, Porterville, 6810 South Africa E-mail: hkling@telkomsa.net

 

 


ABSTRACT

The cosmopolitan ammonite genus Douvilleiceras de Grossouvre, 1894, is the commonest ammonite in the Lowerand lower Middle Albian in northern KwaZulu-Natal. Two variable, dimorphic species, D, mammillatum (Schlotheim, 1813) and D. inaequinodum (Quenstedt, 1849) are recognized, of which the majority of previously named taxa referred to the genus are regarded as synonyms.

Keywords: Cretaceous, ammonite, Albian, Douvilleiceratinae, KwaZulu-Natal, South Africa.


 

 

INTRODUCTION

Douvilleiceras de Grossouvre, 1894, is a cosmopolitan genus that ranges through most of the Lower Albian and into the basal Middle Albian; the type species, Douvilleiceras mammillatum (Schlotheim, 1813) is a global marker fossil for this interval. More than forty species and varieties have been assigned to the genus, and previous authors have adopted very different approaches, some recognizing many, often co-occurring species and varieties (Casey 1962; Owen 1988), a few, variable dimorphic species (Cooper 1982) or, in the case of northwest European occurrences, only two successive species (Amédro 1992, p. 198). The reasons for these different approaches are several (Cooper 1982, p. 271): narrow species concepts that recognize only limited intra-specific variation; failure to recognize large and small individuals as dimorphs, and failure to recognize that immature specimens of the same size may be macro- and microconchs at different ontogenetic stages. A further complication noted by Casey (1962, p. 264) is a taphonomic one: many of the classic occurrences of Douvilleiceras in Europe (and indeed elsewhere: Kennedy & Fatmi 2014) are in condensed phos-phatic nodule beds where only nuclei and small individuals (commonly internal moulds) are differentially preserved. The interest of the present material is that it comes from expanded terrigenous-clastic sequences with juveniles and adult macroconchs and microconchs.

Wherever large numbers of Douvilleiceras are known, they commonly fall into two groups (Amédro 1992). In the mammillatum group, the ornament ofthe late phragmocone and early adult body chamber are characterized by septate umbilical and inner ventrolateral spines (conical tubercles on internal moulds), a weak inner lateral bulla, and a ventrolateral shoulder bearing up to six rows ofclavi, developed from a system of spiral grooves and ridges borne on a blunt outer ventrolateral bulla in the earlier ornamented ontogenetic stages. There is a shallow ventral sulcus in costal section, although this may narrow on adult body chambers, and a feeble siphonal clavus may develop. In northwest European successions they vary from relatively broad in the earliest member of the group (Douvilleiceras leightonense Casey, I962, p. 274, pl. 41, fig. 1; pl. 42, fig. 3; text-figs 96, 97, 102i, 103e-h; see Figs 1, 2, herein), and narrower in the later, upper Lower Albian D. mammillatum (Schlotheim, 1813) (Fig. 3), and maybe lost in some individuals (Fig. 4). The second, Douvilleiceras inaequinodum group, is characterized by hypernodosity, with the development of large, finger-like outer ventrolateral tubercles bearing spiral grooves and ridges (Fig. 5), the latter corresponding to the ventrolateral clavi of the mammillatum group at the same ontogenetic stage. In both groups, tuberculation declines and effaces progressively, with ribs dominant on the later parts of the adult body chamber (Figs 2, 7). It is perfectly possible that, at any stratigraphic level, these two groups are merely parts of a continuum of variation in a single species, given the wide range of intraspecific variation shown by many other ammonite species (as with the classic example of Neogastroplites: Reeside & Cobban 1960); the present material does not, however, allow us to demonstrate this.

 

CONVENTIONS

Dimensions are given in millimetres: D = diameter; Wb = whorl breadth; Wh = whorl height; U = umbilicus; c = costal dimension; ic = intercostal dimension. Figures in brackets are dimensions as a percentage of the diameter. The suture terminology is that of Korn et al. (2003): E = external lobe; A = adventive lobe (= lateral lobe, L, of Kullmann&Wiedmann1970); U=umbilicallobe; I=internal lobe.

 

REPOSITORIES OF SPECIMENS

BGS: British Geological Survey, Keyworth, Nottingham-shire.

BMNH: The Natural History Museum, London.

SAM: The South African Museum, Cape Town. (Due to building alterations, collections in the Natural History Collections Department of the museum, are currently not available for study.)

OUM: Oxford University Museum of Natural History.

 

LOCALITY DETAILS

Details of field localities are given by Kennedy & Klinger (1975); further descriptions of these localities are deposited in the Geological Collections, Oxford University Museum of Natural History, The Natural History Museum, London, and the Natural History Collections Department, Iziko, South African Museum, Cape Town. The present material comes from the following localities in association with the ammonite taxa noted below.

Locality 35. Cliff and stream sections extending over several hundred metres along the Mzinene, approximately 1200 m NE of the farm Amatis, north of Hluhluwe, 27°58'03"S, 32°18'31"E. Mzinene Formation, Albian III. Aioloceras besairiei (Collignon, 1949), Carinophylloceras collignoni Klinger, Wiedmann & Kennedy, 1975, Ammonoceratites (Ammonoceratites) mahadeva (Stoliczka, 1865), Anagau-dryceras sacya (Forbes, 1846), Umsinenoceras linguatuber-culatum Kennedy, Wright & Klinger, 1979, Beudanticeras komihevitraense Collignon, 1950, Alopecoceras ankeritterae Kennedy & Klinger, 1978, Lyelliceras latilii Kennedy & Klinger, 2008, Protanisoceras (Rossalites) aff. superbus (Collignon, 1949). The assemblage is dated as upper Lower Albian on the basis of common taxa occurring at locality 53, noted below.

Locality 36. Degraded river cliff on the eastern bank of the Mzinene, close to the boundary of lots H84 14107 and H 85 14108, north of Hluhluwe, 27°57'14"S, 32°18'34"E. Mzinene Formation, Albian III. C. collignoni, A. sacya, A. besairiei, B. komihevitraense, D. mammillatum. Upper Lower Albian.

Locality 53. Derelict dam site on Indabana 13162, 2.2 km south of the farm Izwehelia, north of Hluhluwe, 27°52'24"S, 32°19'02"E. Mzinene Formation, Albian III. Desmoceras latidorsatum (Michelin, 1838), A. besairiei, A. ankeritterae, Tegoceras mosense (d,Orbigny, 1841), D. mammillatum, D. orbignyi.The presence of T. mosense dates the assemblage to the late Early Albian; in Western Europe the species ranges from the Cleoniceras floridum Subzone of the Sonneratia chalensis Zone to the Protohoplites puzosianus Subzone of the Otohoplites auritiformis Zone, the mid-Douvilleiceras mammillatum Zone of authors.

Locality 142. Hillside east of track leading to mine in the southern part of the Mkuze Game Reserve, 27°44'24"S, 32°17'12"E. Mzinene Formation, Albian III. C. collignoni, A. besairiei, D. mammillatum, D. inaequinodum. Upper Lower Albian, as locality 53.

Locality 154. Abandoned road metal quarry south of track 500 m east of Mantuma Camp, Mkuze Game Reserve, 27°35'33"S, 32°13'38"E. Mzinene Formation, Albian III. Oxytropidoceras (O.) alticarinatum Spath, 1922, Lyelliceras lyelli (d'Orbigny, 1841), L.pseudolyelli (Parona & Bonarelli, 1897), Pseudobrancoceras versicostatum (Michelin, 1838), Ndumuiceras variabile Kennedy& Klinger, 2009, Mkuziella andersoni Klinger & Kennedy, 2008, D. mammillatum, D. inaequinodum. Lower Middle Albian.

Locality 169. Mfongosi Spruit, gully and adjacent hill slopes on the north side of the stream 2 km east of the old drift, 27°31'38"S, 32°09'57"E. Mzinene Formation, Albian II-III. D. mammillatum, D.cf. inaequinodum. Upper Lower Albian.

Locality 174. Mlambongwenya Spruit, shallow excavations and road sections extending from the store south towards the drift, 27°11'02"S, 32°11'25"E. Mzinene Formation, Albian III. C. collignoni, Bhimaites sp., D. mammillatum, D. inaequinodum. Upper Lower Albian.

Locality 175. Exposures in and around gully west of the track leading SW from Ndumu in Impala, 300 m south of Quotho Pan, 26°56'22"S, 32°12'48"E. Mzinene Formation, Albian II-III. Eotetragonites (Eotetragonites) raspaili raspaili Breistroffer, 1947, Tegoceras camatteanum (d'Orbigny, 1841), T. mosense, N. variabile, D. mammil-latum. Upper Lower Albian, as locality 53.

Locality 176. Slopes south of the track and north of Quotho Pan across the boundary of Impala and Wisteria 18122 sections, 26°55'59"S, 32°12'48"E. Mzinene Formation, Albian III. Lyelliceras lyelli, L. pseudolyelli, Pseudobranco-ceras versicostatum, M. andersoni, D. mammillatum. Lower Middle Albian.

Southwest of Ndumu; scattered outcrops of the Mzinene Formation. The presence of Lyelliceras pseudolyelli and L. lyelli indicate the presence of upper Lower and Lower Middle Albian.

 

SYSTEMATIC PALAEONTOLOGY

Suborder ANCYLOCERATINA Wiedmann, 1966

Superfamily DOUVILLEICERATOIDEA Parona & Bonarelli, 1897

Family DOUVILLEICERATIDAE Parona & Bonarelli, 1897

Subfamily DOUVILLEICERATINAE Parona & Bonarelli,1897

Genus Douvilleiceras de Grossouvre, 1894

(? = Trinitoceras Scott, 1940, p. 1016; ? = Eodouvilleiceras Casey, 1961, footnote on p. 191))

Type species

Ammonites mammillatus Schlotheim, 1813, p. 111, by the original designation of de Grossouvre, 1894, p. 26; ICZN Opinion 422, 1956; ICZN Specific Name no. 764.

Diagnosis

There are four successive ontogenetic stages following the initial smooth stage. In the first ornamented ontogenetic stage, primary ribs bear inner ventrolateral spines (conical tubercles on internal moulds) and outer ventrolateral bullae, linked over the venter by a low transverse rib, succeeded by a ventrolateral and ventral constriction, with occasional nontuberculate intercalated ribs. In the second ornamented stage, umbilical spines (tubercles on internal moulds) appear on the primary ribs, and the ventrolateral bullae, strong to weak, develop a spiral groove separating spiral ridges. In the third ornamented stage, a weak inner lateral tubercle appears, and the outer ventrolateral bulla develops additional spiral grooves, separated by spiral ridges. The outer ventrolateral bulla may efface, leaving the ventrolateral shoulder ornamented by up to six rows of ventrolateral clavi, developed from the spiral ridges, or strengthen into a massive, blunt horn; intercalated ribs may be present with or without tubercles. A mid-ventral sulcus is present in costal section.This stage extends onto the adapical part of the adult body chamber. In the fourth ornamented stage, the tubercles decline and efface, the umbilical bullae persisting or not, the ribs primaries plus long and short intercalated ribs. A delicate siphonal clavus may appear, and the mid-ventral sulcus is lost. Markedly dimorphic, with adult macroconchs reaching diameters of up to 800 mm. A dorsal callosity covers the ventrolateral shoulders and venter and partially encloses the inner ventrolateral spines. Suture quadrilobate, E/A large, bifid, A trifid.

Discussion

The sequence of early ontogenetic stages seen in Douvilleiceras was already recognized by Jacob (1905, p. 414), as noted by Latil (2011, p. 369). In most areas where there are significant numbers of Douvilleiceras, they fall, as indicated in the diagnosis, into two morphological groups, here termed the mammillatum and inaequinodum groups. The former is characterized by the decline of the outer ventrolateral bulla and its replacement by several rows of ventrolateral clavi on the ventrolateral shoulder in the third ornamented stage, as a result the mid-ventral sulcus is shallow, varying from broad in D. leightonense Casey, 1962 (Figs 1, 2) to as wide or only slightly wider than the gap between the ventrolateral clavi, as in some variants ofD. mammillatum: the Douvilleiceras clementinum (d'Orbigny, 1841) of authors (Fig. 4), where a siphonal clavus may develop. The orbignyi group, in contrast, are characterized by the strengthening of the outer ventrolateral tubercle into a blunt horn (Fig. 5), seen at its most extreme development in D. benonae Besairie, 1936 (p. 164, pl. 15, figs 15, 16; see also Collignon, 1963, pl. 284, fig. 1244). In both groups, this ornament extends onto the adapical part of the adult body chamber, after which tubercles decline and efface, and may be lost altogether.

The genus Trinitoceras Scott, 1940 (type species Trinitoceras rex Scott, 1940, p. 1017, pl. 60, figs 1-3) was regarded as a synonym of Douvilleiceras by Wright (1957, p. L387) and others. Scott's original account is as follows: 'a very large ammonite from the southern Quitman Mountains is clearly a douvilleiceratid, but it differs by so many characters from the species of the group of D. mammillatum, to which the name Douvilleiceras is now restricted, that a new genus is here created for it.... The douvilleiceratid sculpture is evident up to or beyond a diameter of200 mm. Costae are multi-tuberculate as in Douvilleiceras, but the umbilical tubercles are greatly exaggerated in size, forming large bullae on the umbilical margin at the ends of alternate costae. On later whorls costae lose all trace oftuberculation, but retain, irregularly, their alternate primary and secondary arrangement. On the latest whorls shown, the ribs are nearly all equal, except that an occasional secondary (marked only by the fact that it does not reach the umbilicus) is intercalated between the primaries. The whorl section, degree of evolution, and umbilical area do not differ greatly from like features of well-known species of Douvilleiceras.' Casey (1962, p. 264) also regarded Trinitoceras as a subjective synonym of Douvilleiceras 'confirmed by an inspection of casts of Scott's types supplied me by the U.S. National Museum.' However, The type material of the type species, T. rex, is in the collections of the Bureau of Economic Geology Austin, Texas, and it is the syntypes of the second species referred to Trinitoceras, T. reesidei, that are in the U.S. National Museum of Natural History. Cooper (1982, p. 270) also concluded that Trinitoceras Scott, 1940, was based on large individuals 'that accompany virtually all Douvilleiceras populations' and interpreted them as macroconchs.

Young(1974, p. 187, pl. 6, fig. 10; pl. 7, figs 1,5; text-figs 3d, 3a, i) refigured the holotype of T. rex, as did Robert (2002, pl. 38, figs 1-3). The figures of the earliest growth stages known, at a diameter of about 200 mm according to Young (1974, pl. 6, fig. 10; pl. 7, fig. 5; text-fig. 3i), show an approximately 90° fragment with a maximum preserved whorl height of 75-80 mm. Parts of 10 coarse straight rectiradiate ribs are preserved on the fragment. Primary ribs bear coarse umbilicolateral bullae, inner ventrolateral bullae and outer ventrolateral tubercles, linked across the venter by a broad rib. They are separated by a single intercalated rib with inner and outer ventrolateral tubercles. On the outer whorl, which extends to a diameter of over 400 mm, all trace of tubercles is lost, the primary ribs separated by single intercalated ribs. The specimen is clearly a macroconch. It comes from the upper half of the blue marls of the Cuchillo Formation at the mouth of Mayfield Canyon, on the north bank of the Rio Grande in Trans-Pecos Texas, downstream from Indian Hot Springs at Scott's locality M1 (1940, fig. 139 on p. 984). This locality has yielded Upper Aptian Rhytidohoplites and Hypacanthoplites as well as Lower Albian Douvilleiceras.The ornament of the poor fragment of the inner whorl of the holotype of T. rex does not correspond to that of Douvilleiceras, and we are less certain than previous authors as to its being a junior synonym of Douvilleiceras; it may even be a cheloniceratine. Adult whorls of macroconch Douvilleiceras certainly resemble the adult whorls of T. rex, as with specimens here referred to D. mammillatum, as with the specimen figured by Casey (1962, text-fig. 91 on p. 262) as Douvilleiceras clementinum (d'Orbigny, 1841), and the huge (440 mm diameter) macroconch of Douvilleiceras leightonense Casey, 1962 (text-fig. 96 on p. 275). The holotype of leightonense (Casey 1962, pl. pl. 41, fig. 1) is a microconch of the same species, and has comparable adult body chamber ornament. We would note, however, that adult macroconch chelonicera-tines show similar ornament (Casey 1962).

Latil (2011, p. 369) regarded Eodouvilleiceras Casey, 1961, p. 191, footnote 1) as a synonym of Douvilleiceras.Itwas introduced as follows: 'Eodouvilleiceras gen. nov. (type species Douvilleiceras horridum Riedel, 1937 [1938], p. 29, pl. 6, figs 1, 2, Upper Aptian, Colombia. Douvilleiceratinae with simple ribbing and mammiliform ventral tubercles of Douvilleiceras, but with tubercles undivided to an advanced stage of growth.... Characteristic of the uppermost Aptian of South America, but represented perhaps in the 'Clansayes' fauna of France by 'D.' clansayense Jacob (1905, p. 413, pl. xiii, figs 4a-c; non 'D.' clansayense Jacob [& Tobler], 1906 = Cheloniceras helveticum Breistroffer.' Casey subsequently (1962, fig. 90 on p. 261) illustrated a specimen identified as Eodouvilleiceras horridum from the Upper Aptian' near Bogota, Colombia. Etayo-Serna (1979, p. 57) stated that The specimen illustrated by Casey (1962, p. 261, text-fig. 90) as E. horridum (Riedel), Upper Aptian near Bogota' is more like E. pedrocarvajali [Etayo-Serna, 1979, p. 57, pl. 8, fig. 1; text-figs 6Q, U] than like Riedel's species. Both Riedel's species and Casey's figured specimen lack any stratigraphic information (See Riedel, 1938, p. 31; also Univ. California Mus. Paleont. Files).' Latil (2011, p. 369) noted that the holotype of Douvilleiceras horridum differed mainly from Epicheloniceras species by the presence of few intercalatories, high ribs on ventral area and ventrolateral tubercles that are clearly divided into two tubercles, a strong internal one and a weak external one. These diagnostic features do not appear on the late Aptian Douvilleiceras clansayense JACOB, 1905 (p. 413, pl. 13, fig. 4).... Jacob, 1905 (p. 414, pl. 13, fig. 5) pointed out that the ontogeny of some juvenile, primitive members of the genus Douvilleiceras from the condensed lower Early Albian of Près de Rencurel (Isère, SE France) presents, on more or less early stages, a recapitulation of the three morphological stages: the stage of Cheloniceras on early whorls (10-15 mm in diameter), then the stage Epicheloniceras (20-25 mm diameter) and at last the stage Douvilleiceras. This is easily observable on many specimens from the condensed series of the Vercors area, where the Douvilleiceras stage is preceded by an Eodouvilleiceras stage. The genus Eodou-villeiceras, described for transitional morphologies from Epicheloniceras to Douvilleiceras, could only represent an ontogenetic stage of earliest members of the genus Douvilleiceras. Consequently, Eodouvilleiceras is herein considered as a synonym of Douvilleiceras.'

Riedel's original illustrations are reproduced here as Fig. 8. They are reduced, according to Riedel, X0.9. He gives the diameter of the holotype as 68 mm. The present material shows the same ontogenetic stages as those noted by Latil (see above; Figs 9A-E, 10C, D), but the holotype of horridum differs in retaining an outer ventrolateral tubercle with a single groove dividing it into two spiral ridges to a much greater diameter than the present material, where up to three grooves and four ridges develop. A specimen from southwest of Ndumu (OUM KX9885: Fig. 17C, E), 45 mm in diameter bears a striking similarity to the holotype of horridum, but differs in developing two grooves and three spiral ridges from a diameter of around 35 mm. It is also unclear from the figures if the holotype of horridum is a juvenile or an adult. Accordingly, it is treated as only a possible synonym of Douvilleiceras here. We note that Klein & Bogdanova (2013, p. 55) refer 14 species to Eodouvilleiceras, without discussion.

There have been two very different approaches to the interpretation of Douvilleiceras species. The most comprehensive account to date is that of Casey (1962) who recognized 11 species and varieties from the Lower Albian of southern England, noted two species from the Middle Albian of the same area, and recognized six other species in the text. A species-rich Douvilleiceras is also indicated by Owen (1988, table on p. 209), who recognized 12 taxa from his Lower Albian mammillatum Superzone in Europe, with up to five taxa co-occurring in individual subzones. Cooper (1982) listed over 40 trivial names that had been applied to Douvilleiceras, noting that in addition to the co-occurrence of numerous species in British collections, Scott (1940) recognized 11 species in Texas, and Tavani (1942,1949) 8 in collections from Somalia. As Cooper noted, 'Casey's revision, coming at a time when it was the practice to base species on very narrowly defined limits, suffers from oversplitting .. in his revision of the British species of Douvilleiceras, [he] laid much emphasis on the width of the ventral sulcus, number of notches per rib, and the ontogenetic stage at which ornament change occurred as taxonomic criteria. However, many writers have noted that the number of notches increase with diameter, while Collignon (1963), Mirzoyev (1967), and McLearn (1972) have all reported specimens with different numbers of notches on opposed flanks. Consequently, this criterion is considered to be of very limited taxonomic significance.' Casey himself noted (1962, p. 263) that 'The eight species described below thus come from a limited range of strata, and they constitute a closely interconnected plexus that in former days would have been interpreted (perhaps correctly) as one large, highly variable species', and (1962, p. 282) that transitions between his Douvilleiceras alternans and Douvilleiceras orbignyi Hyatt, 1903, were not uncommon, referring to them as 'mongrels'.

In the revision of large collections of poorly preserved Douvilleiceras from the upper Lower Albian of Angola, Cooper recognized three taxa only: Douvilleiceras mammil-latum aequinodum (Quenstedt, 1849), D. variabile Tavani, 1949, and D. inaequinodum (Quenstedt, 1849), noting (p. 281) that D. variabile might merely be a morphotype within a polytypic D. mammillatum, but that 'opposition to such gross 'lumping' that such synonymies would involve from one of the referee's of this paper had led to the adoption of a somewhat more cautious approach.'

In contrast, Amédro (1992) recognized only two Douvilleiceras species in the Anglo-Paris basin sequences, and suggested that there might in fact be but a single variable species, in which he recognized no significant morphological changes through time. In the latest review, Klein & Bogdanova (2013) refer 44 species to the genus.

One of the difficulties faced by workers on Douvilleiceras has been that many ofthe classic faunas come from condensed phosphatic nodule beds, where nuclei and phragmocones dominate assemblages, as Casey (1962, p. 264) noted. The present material comes, in contrast, from expanded sequences that preserve nuclei, and both large and small adults. These show that many previous accounts have been based on a narrow interpretation of intraspecific variation, a failure to recognize dimorphism, as a consequence of which individuals of the same size, but at different ontogenetic stages have been compared, and different preservations. We recognize only two species of Douvilleiceras in the KwaZulu-Natal material.

Occurrence

Lower and lower Middle Albian, ranging from the Leymeriella regularis Zone to the Lyelliceras lyelli Subzone in terms of the northwest European sequence. The geographic distribution extends from southern England to France, Switzerland, Germany, the Helvetic Zone of western Austria, Poland, Bulgaria, Romania, Georgia, eastwards to Kazakhstan, Turkmenia, northern India, Pakistan, Japan, British Columbia, California, Arizona, New Mexico, and Texas in the United States, Peru, Colombia, Brazil, Tunisia, Algeria, Gabon, Angola, KwaZulu-Natal in South Africa, Mozambique, Somalia, and Madagascar.

Douvilleiceras mammillatum (Schlotheim, 1813)

Figs 1-4, 6, 7, 9, 10, 11A-C, M-O, 12A-F, 13A-H, 14-18, 21, 22A, B

1813 Ammonites mammillatus Schlotheim, p. 111.

1816 Ammonitesmonile J. Sowerby, p. 35, pl. 117, fig. 1 only.

1841 Ammonites Clementinus d'Orbigny, p. 260, pl. 75, figs 5, 6.

1849 Ammonites monile aequinodus Quenstedt, p. 137, pl. 10, fig. 2.

1878 Acanthoceras mammillare v. Schlotheim; Bayle, pl. 59, figs 1-3.

1888 Ammonites mammillatus de Lapparent & Fritel, pl. 59, figs 1-3.

1907 [Douvilleiceras sp.] Etheridge, p. 87, pl. 5, figs 1, 2.

1923 Douvilleiceras albense Spath, p. 70.

1930 Douvilleiceras mammillatum Schlotheim; Passendorfer, p. 651.

1942 Douvilleiceras monile (Sow.); Tavani, p. 119 (33), pl. 12 (3), fig. 10.

?1942 Douvilleiceras mammillatum (Schl.); Tavani, p. 119 (33).

1942 Douvilleiceras spinosum Tavani, p. 120 (34), pl. 13 (4), figs 1, 2; pl. 14 (5), figs 3, 4, 9.

1947 Douvilleiceras albense Spath; Breistroffer, p. 43 (27). ?1949 Douvilleiceras mammillatum (Schl.); Tavani, p. 109 (37). ?1949 Douvilleiceras monile (Sow.); Tavani, p. 109 (37).

1949 Douvilleiceras variabile Tavani, p. 109 (37), pl. 21 (10), figs 1, 2.

1949 Douvilleiceras cheloniceratiforme Tavani, p. 110 (38), pl. 19 (8), fig. 6.

1962 Douvilleiceras clementinum (d'Orbigny); Casey, p. 263, text-figs 91, 92.

1962 Douvilleiceras mammillatum (Schlotheim); Casey, p. 265, pl. 40, fig. 4; pl. 42, fig. 4; pl. 42, figs 6, 9, 10; text-fig. 102a, b (with synonymy).

1962 Douvillleiceras mammillatum (Schlotheim) var. aequinodum (Quenstedt); Casey, p. 271, pl. 40, fig. 5; pl. 41, figs 5-7; pl. 42, fig. 10; text-figs 94a-c, 95a-b, 102d, 103a-b (with synonymy).

1962 Douvilleiceras mammillatum (Schlotheim) var. praecox Casey, p. 272, pl. 41, fig. 8; text-figs 94d, e, 102c (with synonymy).

1962 Douvilleiceras scabrosum Casey, p. 278, pl. 40, figs 1-3; pl. 42, fig. 2; text-figs 102f, 1031.

1962 Douvilleiceras monile (J. Sowerby); Casey, p. 284, pl. 41, figs 2a, b; pl. 42, fig. 5; text-fig. 102e (with additional synonymy).

1963 Douvilleiceras mammillatum (Schloth.); Collignon, p. 109, pl. 283, figs 1238-1239,1241; pl. 284, fig. 1242.

1963 Douvilleiceras albense Spath; Collignon, p. 112, pl. 284, fig. 1243.

1967 Douvilleiceras subleightonense Mirzoyev, p. 64, pl. 8,figs 1-3; text-fig. 4.

1969 Douvilleiceras mammillatum (Schlotheim); Obata, p. 172, pl. 19, figs 3, 5.

1973 Douvilleiceras spiniferum (Whiteaves); McLearn, p. 62 (pars), pl. 10, fig. 3.

1979 Douvilleiceas mammillatummammillatum(Schlotheim), Casey, 1962; Destombes. p. 69, pl. 4-21, fig. 1.

1979 Douvilleiceras mammillatum var. aequinodum (Quenstedt); Destombes, p. 71, pl. 4-4, fig. 1; pl. 4-5, fig. 2; pl. 4-21, fig. 2.

1979 Douvilleiceras mammillatum var. praecox Casey; Destombes, p. 71, pl. 4-21, fig. 3.

1979 Douvilleiceras perchoisense Destombes, p. 72, pl. 4, fig. 2.

1979 Douvilleiceras aff. scabrosum Casey, 1962; Destombes, p. 73, pl. 4-5, fig. 3.

1979 Douvilleiceras clementinum d'Orbigny, 1841; Destombes, p. 74.

?1980 Douvilleiceras mammillatus (Schloth.); Krishna, p. 51, non pl. 1, figs 2, 6, 7.

1981 Douvilleiceras mammillatum (Schlotheim); Chiriac, p. 86, pl. 17, fig. 1.

?1981 D. inaequicostatum Chiriac, p. 87, pl. 18, fig. 3; text-fig. 36.

?1981 Douvilleiceras monile (J. Sowerby); Chiriac, p. 86, pl. 13, fig. 3.

1982 Douvilleiceras mammillatum var. aequinodum (Quen-stedt, 1849); Cooper, p. 272, figs 4a,b, 6c-g, 7d, g-I', 8a, b'' 9a-c, e, 10c, d, 12a, b, 17a (with additional synonymy).

1983 Douvillleiceras mammillatum (Quenstedt); Weidich,Schwerd & Immel, p. 566, pl. 2, fig. 6.

1986 Douvilleiceras sp. juv.; Kennedy, text-fig. 2. 8-16. 1988 Douvilleiceras mammillatum (Schlotheim); Owen, text-fig. 31.

1988 Douvilleicerasperchoisense Destombes; Owen, p. 210.

1988 Douvilleiceras mammillatum praecox Casey; Owen, p. 211.

1990 Douvilleiceras mammillatum (Schlotheim); Marcinowski & Wiedmann, p. 51, pl. 7, figs 5, 6

1996 Douvilleiceras mammillatum (Schlotheim); Wright, p. 269, text-fig. 209.2.

1997 Douvilleiceras mammillatum mammillatum (Schlotheim,

1813); Kennedy in Kennedy, Bilotte & Hansotte, p. 469, pl. 6, figs 20, 21.

1997 Douvilleiceras aff. mammillatum (Schlotheim, 1813); Immel, Seyed-Emami & Afshar-Harb, p. 184, pl. 7, fig. 3.

1997 Douvilleiceras sp. ex. gr. D. monile (Sowerby 1816); Immel, Seyed-Emami & Afshar-Harb, p. 184, pl. 7, fig. 2.

2005 Douvilleiceras mammillatum (Schlotheim); Topchisvilli, p. 389, pl. 98, fig. 1; pl. 99, fig. 1.

2006 Douvilleiceras clementinum (d'Orbigny, 1841);

Guérin-Franiatte in Gauthier, p. 94, pl. 38, fig. 4.

2007 Douvilleiceras mammillatum (Schlotheim 1813); Szives, p. 122, pl. 22, fig. 3.

2008 Douvilleiceras mammillatum aequinodatum (Quenstedt, 1849); Latil, p. 257, pl. 2, figs4, 5 (with additional synonymy).

2010 Douvilleiceras gr. mammillatum (Schlotheim, 1813); Matrion in Colleté, p. 182, text-fig. 127 c, d.

2010 Douvilleiceras clementinum (d'Orbigny, 1841); Matrion in Colleté, p. 182, text-fig. 127b; 128e; 129a.

2013 Douvilleiceras albense Spath, 1 923; Klein & Bogdanova, p. 59 (with additional synonymy).

2013 Douvilleiceras cheloniceratiforme Tavani, 1949; Klein & Bogdanova, p. 64.

2013 Douvilleiceras clementinum (d'Orbigy, 1841); Klein & Bogdanova, p. 60 (with additional synonymy).

2013 Douvilleiceras mammillatum aequinodum (Quenstedt, 1849); Klein &Bogdanova, p. 63(with additional synonymy).

2013 Douvilleiceras mammillatum mammillatum (Schlotheim, 1813); Klein &Bogdanova, p. 64(with additional synonymy).

2013 Douvilleiceras mammillatumpraecox Casey, 1962; Klein & Bogdanova, p. 68 (with additional synonymy).

2013 Douvilleiceras monile J. Sowerby, 1816); Klein & Bogdanova, p. 68 (with additional synonymy).

2013 Douvilleiceras perchoisense Destombes, 1979; Klein & Bogdanova, p. 63.

2013 Douvilleiceras scabrosum Casey, 1962; Klein & Bogdanova, p. 63 (with additional synonymy).

2013 Douvilleiceras spinosum Tavani, 1942; Klein & Bogdanova, p. 63.

2013 Douvilleiceras subleightonense Mirzoyev, 1967; Klein & Bogdanova, p. 73.

2013 Douvilleiceras variabile Tavani, 1942; Klein & Bogdanova, p. 73.

2014 Douvilleiceras clementinum (d'Orbigny, 1841); Amèdro,

Matrion, Magniez-Jannin & Touch, pl. 3.

Type

The neotype is no. C12491 in the collections ofthe Natural History Museum, London, figured by Casey, 1962, pl. 41, fig. 4, from the condensed Lower Albian Cleoniceras floridum Subzone-Otohoplites raulinianus Subzone fauna, foreshore outcrops at Copt Point, Folkestone, Kent. It is illustrated here as Fig. 3.

Material

OUM KX10994-11016, 11019-22, from locality 35. OUM KX11052-56, from locality 36. OUM KX4851-2,

4855-7, 4862, 4865-6, 4868, 4872-5, 4878, 4883-87, from locality 53. OUM KX6148-9, 6151, from locality 142. OUM KX9298, 9300, and 9302-3, from locality 154.

OUM KX9922,9923,9924/9927 (parts of the same specimen), 9925-6, 9928-32, and 12643, from locality 174.

OUM KX9941, 9943, 9950, and 10035 from locality 175.

OUM KX10005-13, 10015-6, 10016, and 12379, from locality 176. OUM KX9881-9885, 9888-9, 9892, and 12608, from southwest of Ndumu.

Description

Selected specimens are described belowbylocalitynumber. Material from locality 35. There are 27 specimens.

 

 

OUM KX10995-6,10998,11012, and 10119-11022 preserve early growth stages between 16.8 and 24.8 mm.

OUM KX11021, 16.8 mm in diameter (Fig. 9A-C), has, at the adapical end of the outer whorl, widely separated, barely detectable prorsiradiate primary ribs on the inner flank that strengthen into massive conical inner ventrolateral tubercles that are the bases of septate spines (preserved in one instance in OUM KX10995: Fig. 9D, E) these give rise to a narrow rib that passes straight across the venter, and bears a feeble outer ventrolateral bulla. The first two of these ribs is succeeded by a shallow ventral constriction. The primary ribs are separated by single intercalated ribs that arise on the ventrolateral shoulder, and bear outer ventrolateral bullae only. There are 10-11 primary ribs, and a total of 15 ribs at the ventrolateral shoulder on the outer whorl of this specimen. On the adapertural most of the primary ribs, a tiny, incipient umbilical bulla is present. In OUM KX 11019, 23 mm in diameter, a median groove appears on the outer ventrolateral tubercles of the last few ribs, dividing them into two spiral ridges. OUM KX10998 (Fig. 10C, D), 25.1 mm in diameter, shows the progressive strengthening of the umbilical bullae. OUM KX10999 (Figs 10E-G, 14A-C), has a depressed reniform whorl section with an intercostal whorl breadth to height ratio of 1.4. There are nine coarse, straight, prorsiradiate ribs on the adapertural half of the outer whorl, most of them primaries, with small umbilical bullae, and all with strong, conical inner ventrolateral tubercles (the bases of septate spines) and a strong outer ventrolateral bulla. This is divided into two spiral ridges by a groove on the adapical part of the outer whorl, and into three spiral ridges by two grooves, the second groove developing on the outer side of the outer ventro-lateral bulla, on the adapertural half of the outer whorl. There is a well-developed dorsal callosity on the adapical 120° sector of the outer whorl (Fig. 10E).

OUM KX11011 (Fig. 9F-H) is a finely ornamented individual with a maximum preserved diameter of 43.2 mm. There are 23-24 primary ribs on the outer whorl, together with occasional long intercalated ribs. The ribs are narrow, straight and prorsiradiate, the primaries with weak umbilical bullae. The ribs bear sharp septate inner ventrolateral spines where shell is preserved as on the adapical part ofthe outer whorl, and these are stronger than the umbilical bullae. On the adapical part, where shell is absent, there are inner ventrolateral bullae, only slightly stronger than the umbilical. The outer ventrolateral bulla of the earlier ontogenetic growth stages is assimilated into the rib, the outer part of the ventrolateral shoulder bearing four small spirally elongated clavi. The mid-ventral region is concave in intercostal section. OUM KX11008 (Fig. 9M, N) is a coarsely ornamented individual 55.2 mm in diameter. There are 21 ribs on the outer whorl. They arise at the umbilical seam, and mostbear a small, but progressivelystrengthening umbilical bulla, a larger, conical inner ventrolateral spine base, and a strong outer ventrolateral tubercle, divided into three spiral ridges by two grooves, the ridges strengthening progressively towards the mid- venter, which is deeply concave. The adapertural three ribs bear a feeble inner lateral tubercle. The largest specimen from this locality is OUM KX11010 (Fig. 9K, L), an internal mould of a 240°body chamber, the original estimated diameter of the specimen 75 mm. There are ten primary ribs on the specimen, arising at the umbilical seam, sweeping back across the umbilical wall and developing into an umbilical bulla of variable strength, the bullae in some cases flat-topped, suggesting they may have been the septate base of a spine, now lost. The relatively coarse ribs bear a weak inner lateral bulla, a stronger inner ventrolateral spine base, and four progressively strengthening clavi on the ventrolateral shoulder. There are three single weak intercalated ribs between successive primaries on the adapical part of the specimen, one with a minute outer ventrolateral bulla. Of the five larger specimens, 40-75 mm in diameter in the assemblage, six belong to this coarse ribbed variant, with a single finer-ribbed individual (OUM KX11011).

Material from locality 53. There are 19 specimens, many of them fragments, with whorl heights of between 13 and 46 mm, all retaining recrystallized shell.

 

 

All specimens are whole or fragmentary phragmocones, the largest fragment corresponding to an original estimated diameter of 120 mm approximately. Coiling is involute, the umbilicus deep, the feebly convex umbilical wall notched to accommodate the septate inner ventrolateral spines of the preceding whorl, the umbilical shoulder broadly rounded. The intercostal whorl section is depressed reniform, with whorl breadth to height ratio of up to 1.25. OUM KX4872 (Fig. 11M-O) is 52.2 mm in diameter. There are 21-22 ribs on the outer whorl, all primaries that arise at the umbilical seam and strengthen across the umbilical wall and shoulder, where most but not all develop into a small bulla. The ribs are straight and feebly prorsiradiate on the flanks, and pass straight across the venter. They strengthen across the flanks, and develop into small conical inner ventrolateral tubercles that are the bases of septate spines, well preserved on the penultimate whorl, while an additional row of inner lateral tubercles appear and strengthen over the adapical 120° sector of the outer whorl. The ribs strengthen further across the ventrolateral shoulders, where five small spirally elongated clavi are separated by grooves. A strong transverse rib links the tubercles across the venter, which is concave in intercostal section. The ventrolateral shoulders dorsal of the inner ventrolateral tubecles and the venter of the adapical half of the outer whorl are covered by the dorsal callosity of the now missing succeeding whorl (Fig. 11N). OUM KX4855, although worn, has over 30 finer, more delicate ribs on the outer whorl, the umbilical and inner ventrolateral tubercles subequal, and has developed an inner lateral tubercle from the beginning of the outer whorl. OUM KX4856 is a coarser ribbed individual with 20 primary ribs on the outer whorl, the umbilical bullae of varying strength, and occasional non-bullate primaries/long intercalated ribs to give a total of 24 ribs at the ventrolateral shoulder. The inner ventrolateral tubercle is stronger than the umbilical at the beginning ofthe outer whorl but weakens progressively with the umbilical bullae stronger than the inner lateral and inner ventrolateral tubercle on the adaper-tural part of the outer whorl. There are clearly differentiated outer ventrolateral bullae on the adapical part of the outer whorl, divide into four spiral ridges separated by three grooves, but as size increases bullae are replaced by a strengthened ventrolateral rib bearing five clavi separated by grooves, derived from the grooves and ridges on the outer ventrolateral bulla on the adapical part of the whorl. The largest fragments (OUM KX4862, 4865, 4878: Fig. 12A-F) show the weakening and eventual disappearance of the ventral sulcus in the costal section, and the narrowing of the relatively wide separation between the outermost of the tubercles on either side of the venter, with eight tubercles on the ribs on either side. There are 13 finely ribbed specimens and three slightly more coarsely ribbed specimens (OUM KX4856: Fig. 11A-C) in the assemblage.

Material from locality 142. There are three specimens. OUM KX 6151 is a well-preserved 60° sector of juvenile phragmocone retaining recrystallized shell, with a maximum preserved costal whorl height of 17 mm. Six ribs are preserved on the fragment. There are three primaries with strong umbilical bullae, stronger inner ventrolateral spine bases, and three spiral ridges separated by grooves on the outer ventrolateral bulla. The three long intercalated ribs alternate regularly with the primaries, and bear very feeble inner ventrolateral tubercles, the outer ventrolateral tuberculation as on the primary ribs. The ventral sulcus in the costal section is relatively wide. OUM KX6149 (Fig. 13G) is an internal mould of a 120° sector of phragmocone with a maximum preserved whorl height of 36.3 mm and a whorl breadth to height ratio of 1.18. Fourteen ribs are preserved on the fragment. Seven are primaries, with small umbilical bullae, feeble inner lateral bullae, and conical inner ventro-lateral tubercles. The ventrolateral shoulders bear four rows of small clavi; there is no mid-ventral sulcus. The long intercalated ribs lack an umbilical bulla, and have a similar ventrolateral ornament to the primaries. OUM KX6148 (Fig. 13E, F) is a 43 mm nucleus and an internal mould of a 120° sector of body chamber with a maximum preserved whorl height of 37 mm and a whorl breadth to height ratio of 1.16. There are 13 ribs on the fragment, eight of them primaries. The ribs arise at the umbilical seam and strengthen across the umbilical wall to link to well-developed umbilical bullae that project into the umbilicus. They are straight, prorsiradiate, flat-topped, wideningprogressivelyacross the flanks, and separated byrelativelydeep, narrowinterspaces. There are small conical inner lateral and inner ventrolateral tubercles, and six rows of clavi on the ventrolateral shoulder, the mid-ventral sulcus narrow. Intercalated ribs lack an umbilical, and sometimes an inner lateral tubercle, but have a ventrolateral ornament matching that of the primary ribs.

Material from locality 174. There are 10 specimens.

 

 

Many of the specimens retain partially exfoliated shell. OUM KX9926 (Fig. 10A, B) is a well-preserved nucleus 33.2 mm in diameter. There are 10 ribs on the outer half whorl, with very strong conical inner ventrolateral bases to septate spines, and larger outer ventrolateral tubercles, divided into two spiral ridges by a groove. OUMKX9932 (Fig. 15E, F), with a maximum preserved diameter of 57.3 mm has, throughout the outer whorl, a progressively strengthening umbilical bulla that is weaker than the inner ventrolateral, with the outer ventrolateral tubercle divided into three spiral ridges, separated by grooves. There is a single weaker, intercalated rib at the greatest preserved diameter. OUM KX9931, 66.7 mm in maximum preserved diameter, and OUM KX9930 (Fig. 14D-F), 72.2 mm in maximum preserved diameter, both show the appearance of a feeble inner lateral tubercle, and the assimilation of the outer ventrolateral bulla into the ventrolateral part of the rib, the spiral ridges of the earlier ontogenetic stages strengthened into clavi, with the addition of fourth row.

OUM KX9922 (Fig. 14I) is an incomplete nucleus 55 mm approximately in diameter, and a halfwhorl ofcrushed body chamber with an estimated diameter of 140 mm; it is inter-preted as an incomplete macroconch. The penultimate whorl has primary ribs with well-developed small umbilical bullae, a smaller inner lateral tubercle at the greatest preserved diameter, and well-preserved inner ventrolateral spines. The adapical end of the outer whorl fragment is phragmocone, the greater part is body chamber. On the phragmocone fragment, the primary ribs bear umbilical bullae, a weak inner lateral tubercle, stronger inner ventro-lateral, and four narrow clavi on the outer part of the ventrolateral shoulder. OUM KX12643 (Fig. 6) is the phragmocone of a macroconch 195 mm in diameter. A somewhat battered individual, the primary rib at the adapical end of the outer whorl with an umbilical bulla, stronger inner ventrolateral tubercle, and four rows of spiral ridges borne on the outer ventrolateral bulla which is thereafter assimilated into the rib, the ventral costal rib profile changing from markedly sulcate to rounded and feebly convex, lateral, then ventrolateral tubercles effacing, leaving only umbilical bullae on crowded, rounded prorsiradiate ribs that strengthen across outer flanks, ventrolateral shoulders and venter, which the ribs cross near-transverse OUM KX9924/7 (Fig. 15A-C: OUM KX9924 and 9927 are fragments of the same specimen) and 9929 (Fig. 14G, H) are closely comparable individuals, with up to 240° of outer whorl preserved, most or all of which is body chamber; they are interpreted as near-complete microconchs. Ornament is ofcoarse crowded ribs, most of them primaries, with occasional long intercalated ribs, separated by deep interspaces. In OUM KX 9924/7, there are 14-15 primaries and 28 ribs in total on the 240° sector of body chamber preserved. On the adapical part, the primary ribs bear nine rows of tubercles, the umbilical, inner lateral and inner ventrolateral rounded-conical, the ventrolateral rows clavate, the ventral sulcus narrow. On the adapertural part, the ribs crowd, the umbilical bullae and flank tubercles are lost, the tubercles on the ventrolateral shoulders weaken markedly, and the ribs pass straight across the venter, with a tabulate profile in costal section, rather than sulcate as on the adapical most part. In OUM KX9929 (Fig. 14G, H) the ventral sulcus is wider at the adapical end of the body chamber, with a total of eight rows of tubercles. towards the adapertural end of the fragment a row of very feeble siphonal clavi appear, and the ventral sulcus is eliminated.

Material from locality 175. There are four specimens. OUM KX9943 (Fig. 16A, B) is a fragment with an estimated original diameter of 92 mm retaining extensive areas of original shell material; the adapertural 90° sector is body chamber. This is a relatively weakly tuberculate individual, with a broad, shallow ventral sulcus in costal section. OUM KX9941 (Fig. 13H) is a very well-preserved ventral region of a body chamber fragment retaining partially exfoliated, limonitized shell material. The ventral sulcus is narrow, with five rows of subequal ventrolateral clavi visible.

Material from locality 176. There are 13 specimens.

OM KX10009, 10015, and 12379 (Fig. 13C, D) are relatively weakly tuberculate individuals; OUM KX12379 is the best-preserved, with a diameter of 60 mm, retaining original shell material. It has a 240° sector of body chamber, and is interpreted as an adult microconch, the smallest in the KwaZulu material. There are small umbilical, and larger inner ventrolateral spines on the primary ribs on the phragmocone, and four rows of clavi on the ventrolateral shoulder,the ventral sulcus wide and very shallow. This style of ornament extends onto the adapical part ofthe body chamber, where there are long intercalated ribs with no, or very weak tubercles. On the adapertural part, the umbilical and inner ventrolateral spines persist, the ventrolateral clavi weakened. OUM KX10010 (Fig. 13A, B) is a rather worn finely ribbed variant, with 180° of body chamber preserved. OUM KX 10007 (Fig. 14J, K) consists of a 45 mm approximately nucleus with a well-preserved 120° sector of body chamber retaining original shell material. It is interpreted as a microconch. The maximum preserved whorl heightis 34 mm; the whorl breadthto heightratio 1.26 atthe adapical end. The ribs are wider than the interspaces on the body chamber, with 12 primaries and only two long intercalated ribs. There are conical umbilical and inner ventro-lateral tubercles/spine bases, inner lateral bullae, and six rows of subequal clavi on the ventrolateral shoulder, the ventral sulcus narrow.

Material from southwest of Ndumu. There are nine specimens.

OUM KX9885 (Fig. 17C-E) is a phragmocone 46 mm in diameter. At the adapical end, the distant primary ribs bear umbilical, inner and outer ventrolateral tubercles, the outer ventrolateral tubercles bearing a pair of spiral ridges, separated by a median groove. As diameter increases, occasional weak intercalated ribs appear, and a second groove appears on the outer ventrolateral tubercle to give three ridges from a diameter of 35 mm onwards. OUM KX9883 (Fig. 17A, B) and 98834 show the same ontogenetic sequence, bearing umbilical bullae, inner lateral tubercles, inner ventrolateral spine bases, and four rows of narrow clavi on the ventrolateral shoulder at the greatest preserved diameter of 71 mm. OUM KX9881 (Fig. 17F, G), with a maximum preserved diameter of an estimated 80 mm is a near-complete microconch, with the relatively coarse ornament as that of OUM KX9883 on the adapertural part of the phragmocone, with four rows of spiral ridges on an outer ventrolateral bulla, the mid-venter deeply sulcate in costal section visible on three ribs preceding the damaged part of the specimen. The ribs are relatively narrow on the 240° sector of body chamber present. At the adapical end, the outer ventrolateral bulla has been assimilated into the rib and there are subequal umbilical inner lateral and inner ventrolateral tubercles, together with six rows ofventrolateral clavi, the mid-ventral sulcus narrow and shallow. Ribs and tubercles weaken towards the aperture, the ventral sulcus is no wider nor deeper than the distance between adjacent clavi, with relatively narrow ribs bearing up to seven rows of ventrolateral clavi to give ten rows of tubercles on each rib, the flank rows effaced on the last few ribs, indicating maturity.

OUM KX9882 (Fig. 16C, D) is an internal mould of a phragmocone 91 mm in diameter. It has relatively massive whorls compared with other specimens from this locality, the whorl breadth to height ratio 1.22. The ribs are weak and crowded. At the adapertural end there are small, damaged umbilical and inner lateral spines, small inner lateral bullae, and five rows of ventrolateral clavi, the mid-ventral sulcus no wider than the spaces between adjacent clavi.

Discussion

The neotype of Douvilleiceras mammillatum, BMNH C12491(Fig. 3) is a phosphatized internal mould retaining extensive traces of phosphatized shell. The position of the last septum is difficult to establish, but there appears to be just over 180° of body chamber present, the specimen being an incomplete adult microconch. The dimensions are:

D: 80.0 (100); Wb: 42.1 (52.6); Wh: 32.6 (40.7); Wb:Wh: 1.29; U: 27.8 (34.8)

There are 13 ribs on the adapical halfwhorl; a maximum of 22 ribs can be counted on the specimen, and the total number ofribs on the outer whorl is estimated at between 25 and 26. The ribs at the adapical end of the outer whorl bear a small umbilical bulla, a subequal rounded inner lateral tubercle, a larger, conical inner ventrolateral tubercle, and a long outer ventrolateral bulla, divided into four spiral ridges by three spiral grooves, the mid-venter markedly sulcate in costal section. This ornament extends onto the adapical part of the body chamber, beyond which the ventrolateral bulla weakens and effaces, the spiral ridges now ventral clavi. At the greatest preserved diameter, there is a ventral sulcus in costal section that is only slightly deeper than that between the clavi. At this stage, there are umbilical bullae, conical inner lateral and inner ventrolateral tubercles, and five rows ofclavi on the ventrolateral shoulder. Specimens from northern KwaZulu-Natal that correspond to the neotype include individuals that extend to the adult aperture, with a progressive increase in the number ofrows ofventrolateral clavi and decline and effacement oftubercles, where ribbing comes to dominate, interpreted as adult microcochs as little as 80 mm (OUM KX9881: Fig. 17F, G) to 87 mm in diameter (OUM KX9924: Fig. 15A-C), and others such as OUM KX 12643 (Fig. 6), still septate at 195 mm in diameter and interpreted as the phragmocone of a macroconch. The body chamber of OUM KX10007 (Fig. 14J, K) shows the development of six rows of ventro-lateral clavi, and a very narrow mid-ventral sulcus, as does OUM KX6148 (Fig. 13E, F), also a body chamber. A further body chamber fragment,OUM KX 9941 (Fig. 13H) has a very narrow mid-ventral sulcus and five rows of ventrolateral clavi. In OUM KX 9881 (Fig. 17F, G), a seventh row of ventrolateral clavi develops on the body chamber, and the ventral sulcus is no wider than other interspaces between clavi. In OUM KX6149 (Fig. 13G), the mid-ventral sulcus is barely distinguishable from other interspaces on a phragmocone fragment, as in OUM KX4862 (Fig. 12E, F).

Increase in numbers ofrows ofclavi and rows ofthe distinctive mid-ventral sulcus is a feature ofmicroconch bodycham-bers, and at least some fragments ofpresumed macroconch phragmocone.

The lectotype ofDouvilleiceras monile (J. Sowerby, 1816) is BMNH 43941a, the original of J. Sowerby (1816, pl. 117, fig. 1), said to be from Sandgate, near Folkestone, Kent, but as Casey (1962, p. 288) notes, the preservation suggests that it is from the classic main mammillatum phosphate bed at Folkestone that is the source of the neotype of D. mam-millatum. It is illustrated here as Fig. 18. It is a phosphatized phragmocone, 60 mm approximately in diameter when complete. There are 14 ribs, predominantly primaries, on the adapertural half of the outer whorl, with umbilical, bullae, conical inner lateral and inner ventrolateral tubercles, the ribs strengthened on the ventrolateral shoulder at the adapical end of the outer whorl, with three clavi separated by two spiral grooves. As size increases, a third groove appears, so that there are four spiral ridges, the inner very weak. Spath (1923, p. 72) noted that Douvilleiceras monile was connected to D. mammillatum by 'many transitions', but Casey (1962, p. 288) spoke of it as 'a rare and inadequately known species'. We regard it as a variant of D. mammillatum.

Douvilleiceras clementinum (d'Orbigny, 1841) (p. 260, pl. 75, figs 5, 6) was introduced on the basis ofsingle individual 400 mm in diameter, from the environs of Saint-Florentin (Yonne, France), collected by one Clément Mullet, and housed in the Musée de Troyes. The specimen has not been traced, and Guérin-Franiatte (in Gauthier 2006, p. 94, pl. 38, fig. 4) designated a neotype, no. 5789a-1 in the d'Orbigny collection, housed in the Laboratoire de Paléontologie of the Muséum National d'Histoire Naturellle, Paris. It is an incomplete macroconch 210 mm in diameter, from the lower Middle Albian lyelli Subzone Gault of Dienville, Aube, France. A much better preserved individual from Yonne, BMNH 47010 was figured by Casey (1962, text-fig. 91), with a maximum preserved diameter of 200 mm, and also an incomplete macroconch. These specimens differ in no significant respects from adult macroconch D. mammillatum phragmocones from northern KwaZulu-Natal, apart from preservation, the Aube specimens retaining recrystallized shell and umbilical and inner ventrolateral spines. The specimen figured by Bayle (1879, pl. 59, fig. 1: Fig. 7) from Dienville, Aube, and thus a topotype of clementinum, is just over 130 mm in diameter. It is interpreted as the inner whorls of a macroconch. There are 24 small umbilical spines on the outer whorl, feeble inner lateral bullae, strong inner ventrolateral spines, and five rows of feebly clavate ventro-lateral tubercles, and a narrow, shallow mid-ventral sulcus. This is the pattern of tuberculation shown by OUM KX9923 (Fig. 15D, G) at the same size. The earlier growth stages of D. clementinum from Dienville are represented, according to Casey (1962, p. 263), by the holotype of Douvilleiceras albense Spath, 1923 ( p. 70). The holotype is SMC F7727, figured by Casey (1962, text-fig. 92 on p. 263). His illustration is reproduced here as Fig. 4; the specimen was not available to us for study. The figures show an individual 86 mm in diameter, with 24 umbilical spines, giving rise to single ribs with occasional long intercalated ribs appearing on the apertural part of the outer whorl to give an estimated 28 ribs at the ventrolateral shoulder. There are well developed but progressively weakening inner ventrolateral spines, with weak inner lateral tubercles seemingly present only at the greatest preserved diameter, and five rows of ventrolateral clavi, the mid-ventral sulcus narrow, a weak siphonal row appearing at the greatest preserved diameter. The changes in ornament around the outer whorl suggest the specimen to be an incomplete adult microconch. Individuals close to the holotype of D. albense occur in KwaZulu material from localities 53, 142, 175, and 176, localities that either span the Lower/Middle Albian boundary, or are low in the Middle Albian. They are mostly individuals retaining body chamber, the mid-ventral sulcus narrow, with a feeble siphonal clavus appearing in some, as with OUM KX9929 (Fig. 14G, H), a slender individual compared with the holotype ofalbense. We regard these specimens, and the type material of both D. clementinum and D. albense, as late forms of a variable D. mammillatum.

Douvilleiceras solitae (d'Orbigny, 1853) (p. 211, pl 4, figs 1, 2, reproduced as Fig. 19 herein) was based on a specimen 100-110 mm in diameter from the cöte de Petaquero of Nouvelle Grenade, thatis sayto Colombia. Theinnerwhorls of the figure bear no resemblance to any Douvilleiceras known to us, but the outer whorl is more convincing, portraying a very evolute Douvilleiceras with six rows of tubercles. The species was revised by Etayo-Serna (1979, p 54, pl. 7, figs 6, 7; text-fig. 6j), who described it as bearing three rows of spiniform tubercles and three rows of clavi on the ventrolateral shoulder, on the adapical part of the outer whorl of a specimen an estimated 93 mm in diameter, the ventrolateral clavi increasing to five on the adapertural part of the outer whorl. Both Douvilleiceras tarapacaense Etayo-Serna, 1979 (p. 54, pl. 7, fig. 5; pl. 8, figs 2, 6; text-fig. 6c, g) and D. abozagloi Etayo-Serna, 1979 (p. 55, pl. 8, fig. 7), which co-occur with D. solitae in Etayo-Serna's Lower Albian Douvilleiceras solitae-Neodeshayesites coumbianus Zone of the Capotes member of central Colombia appear to be intraspecific variants. The very evolute coiling and less massive whorls of D. solitae and its synonyms separate them from D. mammillatum.

Casey (1962, p 274) compared Douvilleiceras invernoisi (Coquand, 1865) (p. 50; see Fig. 20) with D. leightonense Casey, 1962 (p. 274, pl. 41, fig. 1; pl. 42, fig. 3; text-figs 96, 97, 102i, 103e-h): 'The large size, prominent umbilical tubercles and wide ventral sulcus are all points of similarity with D. invernoisi (Coquand), which also occurs below the maximum development of D. mammillatum. Coquand's type specimen is an ammonite 135 mm in diameter [Pictet & Renevier give the diameter as 160 mm.] from Perte-du-Rhöne (Ain), France, which Pictet & Renevier (1854, p. 23, pl. ii, figs. 1a, 1b) ascribed to Ammonites mammillatus.If correctly figured, it differs from the present species in details of tuberculation, the tubercles being more persistent and differently spaced on the flank, though less vigorous on the venter and outer part of the sides in the young.' Casey also reproduced the figures of Pictet & Renevier (his text-fig. 98 on p. 277), where he referred to it as the holotype. In introducing his new species, Coquand included reference to the description and figures of Pictet & Renevier in his synonymy, and mentioned a specimen from Aptian marls in Aragon, Spain, and one from the 'bancs supérieurs de l'étage Aptien' of Arcaïne. He also records the species from Lancrans (Ain, France). The specimen figured by Pictet & Renevier is thus a syntype. We have thus far failed to trace the figured syntype, said by Pictet & Renevier to be in the Rochat Collection, or the 220 mm diameter syntype in the Mayor Collection. The third and largest syntype, 560 mm in diameter and from Lancrans, survives in the collections of the Musée Cantonal de Géologie, Lausanne, with the catalogue number MGL15704, Fig. 23. It is interpreted as a poorly preserved macroconch Douvilleiceras of the mammillatum group.

There is an uncatalogued specimen in the Matheron Collection (now in the Hungarian Natural History Museum, Budapest) labelled 'Ammonites invernoisi, Coq, Fondoille', the label is not, however, the original, and the specimen is a compressed and finely ribbed acanthoplitine, bearing no resemblance to Pictet & Renevier's figures. We are also less certain than Casey on the age of their specimen. The succession at Perte-du-Rhöne (now flooded) is described in detail by Jayet (1926), and discussed by Kennedy & Delamette (1994). Urgonian limestones are overlain by a glauconitic terrigenous-clastic sequence that ranges from Upper Aptian to Upper Albian. Jayet records Douvilleiceras in association with Leymeriella in his bed3 (p. 176), andin association with Leymeriella and Hoplites in his bed 36 (p. 17). Kennedy & Delamette (1994) suggested that Jayet's bed 36 included remanié Leymeriella associated with ammonites spanning the upper Lower Albian Pseudosonneratia (Isohoplites) steinmanni Subzone to the Hoplites spathi Subzone of the lower Middle Albian. We are, accordingly, less certain than Casey that Pictet & Renevier's specimen is from 'below the maximum development of D. mammilatum.' The figure shows an individual that appears to be an adult, though whether complete or not is unclear. There are weakening, but persistent relatively strong umbilical bullae, and at least five additional rows of tubercles on primary ribs, with one to three long or short intercalated ribs with at least four rows of tubercles between successive primaries. The affinities of the specimen, beyond belonging to the mammillatum group are, to us, uncertain.

Douvilleiceras spiniferum (Whiteaves, 1876) (p. 24, pl. 3, fig. 1; text-fig. 2), from the Haida Formation of the Queen Charlotte Islands of British Columbia was comprehensively revised by McLearn (1972, p. 62, pl. 10, fig. 1-3, pl. 11, figs 1, 2; pl. 28, fig. 10. The lectotype (ibid., pl. 11, fig. 1) appears to be an incomplete microconch. The tuberculation is described by McLearn as comprising six rows of tubercles, three rounded flank tubercles, and three rounded ventro-lateral tubercles on one side, and seven on the other, as a result of the presence of an additional row in an inner ventrolateral position relative to the others. The lectotype of spiniferum thus differs from the neotype of D. mammil-latum in the shape of the ventrolateral tubercles: rounded rather than clavate, and the fewer number of rows, three or four versus five in mammillatum. We note, however, that one of McLearn's specimens (1972, pl. 10, fig. 3) has clavate ventrolateral tubercles, as in mammillatum, but only three rows. A further difference is seen in the original of McLean's pl. 28, fig. 1, a phragmocone estimated to be 220 mm in diameter from the figure (said to be reduced 0.5), and showing loss of tuberculation, a feature generally characteristic of the adult body chamber in D.mammillatum. We exclude spiniferum from the synonymy of mammillatum on the basis of these characters.

Douvilleiceras offarcinatum (White, 1887) (p. 219, pl. 23, figs 3, 4; the figures and description are reproduced in Maury (1936, p. 245, pl. 23, figs 2, 3) was based on a number ofspeci-mens from Sergipe, Brazil, of which two were figured; they are described as having ribs that are 'marked by numerous, more or less distinct, often obscure, nodes, which are arranged in four or five revolving rows on each side of the narrow peripheral depression before mentioned; the two rows which lie nearest the periphery being the most prominent.' White's pl. 23, fig. 3 shows the side view of an individual with a maximum preserved diameter of 61 mm. On the adapical half of the outer whorl, the ribs are coarse and relatively distant, with both bullate primaries and long intercalatories, the former with weak umbilical bullae, stronger inner ventrolateral tubercles, and stronger outer ventrolaterals. The adapertural 120° sector ofthe outer whorl has more regular ribbing, the ribs all primaries, with very weak umbilical bullae, weak inner ventrolateral bullae, and at least two rows of outer ventrolateral clavi. White's pl. 23, fig. 4 shows the ventral view of a specimen with a maximum preserved diameter of 76.5 mm. At the adapical end, four rows of tubercles are visible on the ventrolateral shoulder of the first two ribs, reducing to two on the third, and then to one, that weakens towards the adapertural end. The specimens are interpreted as parts of small adults, presumably micro-conchs. They compare with specimens here assigned to D. mammillatum, White's fig. 3 resembling OUM K9932 (Fig. 15E, F), fig. 4 resembling OUM K9924A (Fig. 15A-C). More and better material is needed to determine the affinities of the species; Cooper (1982, p. 272) regarded the original of Maury's pl. 23, fig. 4 as a possible synonym of his D. mammillatum aequinodum

D. mammillatum paucicostatum (Parona & Bonarelli, 1897) (p. 95(43), pl. 13 (4), fig. 4) is from the condensed Albian of Escragnolles, Alpes-Maritimes, France. It is very evolute, with strongly rursiradiate ribs, some convex across the ventrolateral shoulder, and is a pathological individual in our view, as is the original of Parona & Bonarelli's pl. 13 (4), fig. 5.

The holotype, by monotypy, of Douvilleiceras aurarium Anderson, 1938 (p. 175, pl. 53, fig. 1), from Shasta County in Northern California, is a well-preserved individual retaining extensive areas of shell material, with a maximum preserved diameter of 83 mm. It is illustrated in side view only, and has massive inner ventrolateral tubercles, on the penultimate whorl, not, apparently, developing an inner lateral tubercle. The ventrolateral tuberculation is unclear from the figure, although described by Anderson (1938, p. 175) when comparing it to D. mammillatum, as 'less numerous, more rounded, and on the ventrolateral borders, they are not always multiple'

Douvilleiceras restitutum Anderson, 1938 (p. 175, pl. 54, fig. 2) is based on a holotype 153 mm in diameter, and also from Shasta County. It is described as having three to five rows of rounded spinose tubercles on the early whorls, the umbilical persisting and strengthening. McLearn (1972, p. 66) thought it close to Douvilleiceras spinosum.

Scott (1940) described six species of Douvilleiceras from the Cuchillo Formation of Trans-Pecos Texas, all based on fragmentary, and generally crushed material. They were revised by Young (1974):

Douvilleiceras mammillatum (Schlotheim) emend. Spath; Scott, p. 1007, pl. 56, fig. 10; pl. 57, figs 3, 4. The original of Scott's pl. 56, fig. 10 wasrefigured by Young 1974, pl. 5, fig. 4. The original of Scott's pl. 57, figs 3, 4, was refigured by Young, 1974, pl. 5, figs 1, 2, who referred them to Douvilleiceras spathi Scott, 1940.

Douvilleiceras cuchillense Scott, 1940, p. 1009, pl. 59, figs 3, 4. Holotype refigured by Young 1974, pl. 4, fig. 11, pl. 5, fig. 12, who regarded it as a synonym of D. spathi, giving the latter page priority.

Douvilleiceras offarcinatum (White)?; Scott, p. 1011, pl. 58, figs 4, 5. Scott's specimen refigured by Young 1974, pl. 5, fig. 6, who referred to it as Douvilleiceras cfr. offarcinatum.

D. spathi Scott, 1940, p. 1012, pl. 58, fig. 3; pl. 60, fig. 6. Holotype refigured by Young 1974, pl. 4, fig. 9; pl. pl. 5, fig. 3

D. quitmanense Scott, 1940, p. 1014; p. 61, figs 9, 10. Holotype refigured by Young 1974, pl. 4, fig. 4; pl. 5, fig. 7; text-fig. 3b, who referred to it as Douvilleiceras cfr. mammillatum.

Douvilleiceras n. sp. indet., Scott, 1940, p. 1015, pl. 57, fig. 2. Refigured by Young 1974, pl. 5, fig. 11, who referred to it as Douvilleiceras cfr. mammillatum.

Douvilleiceras [Cheloniceras] adkinsi (Scott, 1940), p. 1005, pl. 56, figs 8, 9. Referred to as Douvilleiceras sp. juv. indet. by Young 1974, p. 192.

Douvilleiceras [Trinitoceras] rex Scott, 1940, p. 1017, pl. 60, figs 1-3. Holotype refigured by Young, 1974, pl. 6, fig. 10, pl. 7, fig. 1 text-figs 2d, 3a, i.

Douvilleiceras [Trinitoceras] reesidei Scott, 1940, p. 1019, pl. 57, figs 5, 6; pl. 58, figs 1, 2, 6, 7; pl. 59, fig. 5. The species was not revised by Young.

Most of the material is poor and fragmentary. We regard the following as belonging to the mammillatum group: D. mammillatum, D. cuchillense, D. offarcinatum?, D. quitmanense, D. n. sp. indet., and D. adkinsi, and some may be synonyms ofD. mammillatum, but more and better material is needed for certain identification (W.J.K. visited one ofthe principal localities, Mayfield Canyon on the north bank of the Rio Grande in Hudspeth County, Texas, in 1973, and found only poor fragments).

Douvilleiceras [Trinitoceras] reesidei is problematic. The venter of the smaller syntype figured by Scott (1940, pl. 57, fig. 6; pl. 59, fig. 5) is a half whorl of a nucleus 67 mm in diameter, with widely separated primary ribs bearing small umbilical bullae, strong conical inner ventrolateral tubercles, and strong, outer ventrolateral tubercles, with two spiral grooves and 3 spiral ridges, and a wide ventral sulcus. The larger syntypes (Scott 1940, pl. 58, figs 1, 2, 6, 7) are described as having only faint tuberculation on the flank at approximately 200 mm in diameter, with all tuberculation lost in the largest, macroconch, syntype at a diameter ofan estimated 400 mm. the coarse ornament ofthe inner whorls, and the presence of up to four long and short intercalated ribs between successive primaries middle growth (Scott 1940, pl. 58, figs 1, 2) distinguish the species from D. mammillatum.

D. spinosum Tavani, 1942 (p. 120 (34), pl. 13 (4) figs 1, 2; pl. 14 (5), figs 3, 4, 9), from Bugda Acable, Somalia, is based on three specimens. It appears to be a strongly tuberculate variant of D. mammillatum with (replaced) shell material preserved, retaining the septate spines on the umbilical and inner ventrolateral tubercles.

D. cheloniceratiforme Tavani (1949, p. 110 (38), pl. 19 (8), fig. 6) is based on a single individual, also from Bugda Acable. Tavani does not give the dimensions; the figure shows a 180° whorl sector, 126 mm in diameter, apparently body chamber, the umbilicus comprising an estimated 30-35% of the diameter, the whorl breadth to height ratio around 1.2 from his figure (fig. a below the plate explanation). It is clearly a macroconch Douvilleiceras, differing in no significant respects from macroconch D. mammillatum from northern KwaZulu-Natal (Fig. 6 herein), but in the absence of information on the inner whorls, cannot be assigned to the species with complete certainty.

D. variabile Tavani, 1949 (p. 109 (37), pl. 21 (10), figs 1, 2, is based on two examples, again from Bugda Acable. Tavani writes of it as 'appartineti di gruppo del Douvilleiceras inaequinodum'. The figures shows a macroconch phragmo-cone with extensive areas of (replaced) shell material. The maximum preserved diameter is 160 mm, and the whorl breadth to height ratio 1.25 (based on fig. a below the plate explanation). The tuberculation of the adapical 240° sector of the outer phragmocone whorl corresponds to that of KwaZulu specimens of comparable size (OUM KX9922: Fig. 14I), while that of the adapertural 120° sector, on which ventrolateral and ventral tuberculation declines, matches that of phragmocone OUM KX12643 (Fig. 6), that we refer to D. mammillatum, ofwhich we regard variabile a synonym. Cooper (1982, p. 278, figs 4g, 7e-f, 8c-d, 9g, 11c-d, 13a, 15e, 22a) referred four worn individuals from Dombe Grande, Angola, to D. variabile. His largest figured specimen is only 80 mm in diameter (Cooper 1982, fig. 8c), and is much smaller than the smallest growth stage recognizable on Tavani's figured specimen. The main criteria cited by Cooper as diagnostic were main ribs with a distinct umbilical tubercle, a pronounced mid-lateral tubercle [inner ventro-lateral in our terminology], and bullate ventrolateral tubercles that weaken beyond 45 mm diameter, and are lost at about 60 mm diameter. At this stage a small tubercle appears between the umbilical and mid-lateral [inner ventrolateral in our terminology], and the ventral tubercles bear three notches, such that there are eight tubercles per rib. There is invariably one, and sometimes two intercalatories between successive long ribs that lack mid-lateral (= inner ventrolateral tubercles of our terminology]. Cooper noted that within his collection 'several individuals seem to combine the characters of D. variabile and D. mammillatum aequinodum.... This seems to suggest that D. variabile is merely another morphotype within a polytypic D. mammil-latum. While this is the writer's belief, opposition to the gross 'lumping' that such synonymies involve from one of the referee's of this paper has led to the adoption of a somewhat more cautious approach. Douvilleiceras variabile is here maintained because the writer does not believe in sympatric subspecies.' The chief distinguishing feature ofthis Angolan material is the invariable presence of one, and sometimes two intercalated ribs between primaries, and the strong inner ventrolateral tubercles. Individuals referred to variabile constitute only 6.5% of the total number of specimens of D. mammillatum aequinodum and D. variabile in the collection. Individuals of this type occur as rarities in the present collection (OUM KX10010, 12379: Fig. 13C-D), and we incline to Cooper's view that these individuals fall within a variable D. mammillatum.

Douvilleiceras? muralense Stoyanow, 1949 (p. 130, pl. 26, figs 1, 2) is a nomen dubium based on a badly weathered fragment of phragmocone from the base ofthe Mural Limestone in Mule Mountains of southeastern Arizona.

Douvilleiceras submammillatum Eristavi, 1955 (p. 151, pl. 7, fig. 1), from the Lower Cretaceous of Georgia, is based on an individual 170 mm in diameter according to the figure (reproduced X0.5) which shows the side view only of a crushed individual with predominantly primary ribs, and umbilical, inner and outer ventrolateral tubercles only visible. As Casey (1962, p. 271) notes, its generic position is uncertain from the figure. Douvilleiceras planum Eristavi,1955 (p. 152, pl. 7, fig. 2) was referred to Eodou-villeiceras by Kvantaliani & Sharikadze in Topchisvili (2005, p. 387, pl. 96, fig. 1) and recorded from the Upper Aptian; thus ruling out its allocation to Douvilleiceras.

Two of the specimens assigned to Douvilleiceras mammillatum by Collignon (1963) are illustrated here as Figs 21A-C and 22A-B. The original of his pl. 283, fig. 1241 was figured considerably reduced at 70 mm in diameter, wheras the dimensions on p. 109 show it to be 90 mm in diameter. It is dated as Middle Albian, and is relatively evolute (U = 34% of the diameter) and has a relatively broad ventral sulcus (Fig. 21C). In this respect it resembles the Lower Albian Douvilleiceras monile of Collignon (1963, pl. 287, fig. 1247 (Fig. 21D, E). We are uncertain of the affinities of these specimens. The original of Collignon's pl. 283, fig. 1239 (Fig. 22A, B) has coarsely ribbed inner whorls, as in OUM KX9932 (Fig. 15E, F)

D. pseudinaequinodatum Collignon, 1963 p. 120, pl. 268, 1249) belongs to the inaequinodum group, and is discussed further below.

D. subleightonense Mirzoyev, 1967 (p. 64, pl. 8, figs 1-3; text-fig. 4) from the Douvilleiceras mammillatum Zone of the Gissar Range, Tadjikistan, is interpreted as a macro-conch of a slender variant of the present species.

D. charshangense Mirzoyev, 1967 (p. 58, pl. 7, figs 1-5; text-figs 1-3), also from the Gissar range of Tadjikistan, belongs to the inaequinodum group, and is discussed further below.

D. perchoisense Destombes, 1979 (p. 72, pl. 4-4, fig. 2) is a typical Douvilleiceras mammillatum. It is from the upper Lower Albian of Aube, France.

D. inaequicostatum Chiriac, 1981 (p. 87, pl. 18, fig. 3; text-fig. 36) from the southern Dobrogea, Romania, is based on a short fragment of phragmocone with a whorl height of 50 mm, and only six ribs preserved, one of which is a short intercalatory, bearing weak outer ventrolateral tubercles. It is a fragment of a macroconch, possibly D. mammillatum, but better regarded as a nomen dubium.

D. compressum Futakami, 2003 (p. 237, figs 1a, b, 2) is from the presumed Lower Albian ofHokkaido, Japan. The holotype, and only known specimen, consists of part of a poorly preserved penultimate whorl, a 120° sector preserving one flank and less than half of the venter, and a further 240° sector with only parts of the flank preserved. It has, on the best-preserved sector (in our terminology) weak umbilical and inner lateral bullae, stronger inner ventrolateral bullae and four 'pustuliform' ventrolateral tubercles. The author regarded the compressed whorl section as diagnostic, but the preservation of the specimen makes the determination of the whorl section uncertain in our view. The shape of the ventrolateral tubercles distinguishes the specimen from D. mammillatum, but we are otherwise uncertain ofits affinities.

Douvilleiceras leightonense Casey, 1962 (p. 274, pl. 41, fig. 1; pl. 42, fig. 3; text-figs 96, 97, 102i, 103e-h, was introduced for the earliest known species ofthe genus, and originally described from southern England. The holotype, BMNH C84735, is shown in Fig. 2. Casey (1962, p. 274) described the typical form as: 'Similar to D. mammillatum up to about 40 mm in diameter, after which distinguished by costae less elevated and not so steep sided, and above all median ventral sulcus very wide and shallow, the bordering tubercles sharp-tipped. From about 100 mm diameter, costae dominate over tubercles and ribbing increasingly dense, tending to unite in pairs at large flat umbilical spine bases. At about 130 mm in diameter ventral and lateral nodes disappear and extra ribs are intercalated in ones, two and threes among the primaries, fading out before reaching the umbilical margin. This type of sculpture persists to about 250 mm in diameter and then degenerates until only faint radial ridges are left on the lower two-thirds of flank. Suture with relatively slender-stemmed saddles compared with that of D. mammillatum.' The species is the presumed ancestor of D. mammillatum and macroconchs reach an enormous size; Casey figured a phragmocone, referred to as cf. leightonense, that is 440 mm in diameter, correspondingto an estimated diameter, with bodychamber, of at least 650 mm. When compared with the largest, presumed macroconch phragmocone in the KwaZulu material (Fig. 8), this is 195 mm in diameter, and has umbilical and inner flank ribbing on the outer whorl like that on the penultimate whorl of Casey's specimen. The holotype of leighto-nense (Fig. 2) appears to be a microconch of the species. It is incomplete, with an estimated original diameter of 120 mm approximately, lacking the inner whorls. There are 14 ribs on the adapical half whorl, predominantly bullate primaries, with well-developed umbilical bullae on most, a small conical inner lateral tubercle, larger conical inner ventrolateral tubercle, and four progressively strengthening clavi on the ventrolateral shoulder ofthe phragmocone, to give a total ofseven rows oftubercles. The ventral sulcus is wide and shallow. The position of the last septum is unclear; perhaps 180° of body chamber are preserved. On the body chamber, the tubercles weaken, the ribs weaken and crowd, the number of non-bullate primaries and long intercalated ribs increase progressively. BMNH C40341 (Fig. 1) is the original of Casey (1962, text-fig. 103g, h). It consists of a 160° sector of phragmocone with a maximum preserved costal whorl height of 24.4 mm. A total of 10 primary ribs are preserved. They are coarse, straight and prorsiradiate, with small umbilical bullae, larger inner ventrolateral bullae and three clavi on the ventrolateral shoulder, becoming progressively stronger towards the mid-venter. There is a single intercalated nontuberculate ventral/ventrolateral rib. There are thus a total of five tubercles on each rib at the end of the adult phragmocone, compared to seven in D. mammillatum at the same ontogenetic stage, while the ventral sulcus is very wide compared to that of the neotype of D. mammillatum (Fig. 3).

The holotype of Casey's Douvilleiceras leightonense var. pringeli (1962, p. 277 pl. 41, fig. 3; text-fig. 102j) was briefly diagnosed as 'A variety with inner whorls coarsely tuberculated as in D. orbignyi Hyatt, the lateral tubercle remaining conspicuous at the middle of the side until at least 75 mm. diameter.'

Douvilleiceras scabrosum Casey, 1962 (p. 278, pl. 40, figs 1-3; pl. 42, fig. 2; text-figs 102f, 103i) differs in no significant respects from D. mammilatum, of which it is a synonym.

Douvilleiceras pustulosum Casey, 1962 (p. 288, pl. 42, fig. 11; text-figs 102g, 103c, d) has a very wide, shallow ventral sulcus, and may be no more than a variant of D. leightonense.

Occurrence

Douvilleiceras mammillatum, as here interpreted, ranges from the kitchini Subzone ofthe chalensis Zone ofthe Lower Albian to the lower Middle Albian lyelli Subzone of the dentatus Subzone in terms of the NW Europen sequence. The geographic distribution extends from southern England to France, Germany, Switzerland, Poland, Romania, Bulgaria, Kazakhstan, Turkmenistan, Iran, northwestern India, northern Pakistan, Tunisia, Angola, northern KwaZulu-Natal, Madagascar, and possibly Peru.

Douvilleiceras inaequinodum (Quenstedt, 1849)

Figs 5, 11D-L, 12G, H, 13I, J, 22C, D

1841 Ammonites mammillaris Schlotheim; d'Orbigny, p. 249 (pars), pl. 73, figs 1-3 only.

1 849 Ammonites monile inaequinodus Quenstedt, p. 138, pl. 10, fig. 1.

1897 Douvilleiceras inaequinodum (Quenstedt); Parona & Bonarelli, p. 95 (43), pl. 13 (4), fig. 6.

1903 Douvilleiceras orbignyi Hyatt, p. 110.

1923 Douvilleiceras aff. inaequinodum (Quenstedt); Spath, p. 70, pl. 5, fig. 4.

1923 Douvilleiceras mammillatum (Schlotheim) var. baylei Spath, p. 70, pl. 5, fig. 4.

1923 Douvilleiceras inaequinodum (Quenstedt); Spath, p. 73, pl. 4, fig. 5; pl. 5, fig. 6 (with additional synonymy).

?1937 Douvilleiceras cf. inaequinodum (Quenstedt); Scott, p. 35, pl. 6, figs 3, 4; text-fig. 1.

1930 Douvilleiceras mammillatum var. baylei Passendorfer, p. 652.

1942 Douvilleiceras benonae Besairie; Tavani, p. 120 (34), pl. 12 (3), fig. 11; pl. 14 (5), figs 1, 2.

1950 Douvilleiceras inaequinodum (Quenstedt); Collignon, p. 46, text-fig. 2.

1962 Douvilleiceras orbignyi Hyatt; Casey, p. 279, pl. 40, figs 6-8; pl. 42, figs 12,13; text-figs 99,100,102h (with additional synonymy).

1962 Douvilleiceras inaequinodum (Quenstedt); Casey, p. 282, text-fig. 95c.

1962 Douvilleiceras alternans Casey, p. 282, pl. 42, fig. 1; text-figs 101, 102l (with additional synonymy).

1962 Douvilleiceras magnodosum Casey, p. 284, pl. 42, fig. 4; text-fig. 102k.

1963 Douvilleiceras aff. baylei Spath; Collignon, p. 118, pl. 287, fig. 1248.

1963 Douvilleiceras pseudinaequinodum Collignon, p. 120, pl. 388, fig. 1249

1965 DouvilleicerasorbignyiHyatt; Howarth, p. 345, pl. 1, fig. 5.

?1967 Douvilleiceras charshangense Mirzoyev, p. 58, pl. 7, figs 1-5; text-figs 1-3.

1974 Douvilleiceras sp.cf. C. orbignyi Hyatt; Young, p. 188, pl. 5, figs 9, 10.

1979 Douvilleiceras orbignyiHyatt; Destombes, p. 71, pl. 4-5, fig. 1; pl. 4-6, fig. 1.

1979 Douvilleiceras alternans Casey; Destombes, p. 72.

1979 Douvilleiceras inaequinodum (Quenstedt); Destombes, p. 72, pl. 4.6, fig. 2.

1980 Douvillleiceras mammillatum (Schloth.); Krishna, pl. 1, figs 2, 7 (non p. 51).

?1980 Douvilleiceras inaequinodum Quenstedt; Krishna, p. 51, non pl. 2, figs 2, 4.

1982 Douvilleiceras inaequinodum (Quenstedt, 1849); Cooper, p. 281, text-figs 4c,d, f; 6a; 7a-c; 9d, f, h; 10e; 11a; 12c, d, g, h.

1988 Douvilleiceras alternans Casey; Owen, p. 211.

1988 Douvilleiceras magnodosum Casey; Owen, p. 212.

1990 Douvilleiceras orbignyi Hyatt; Marcinowski & Wiedmann, p. 52.

1997 Douvilleiceras orbignyi Hyatt, 1903; Kennedy in Kennedy, Bilotte & Hansotte, p. 469, pl. 6, figs 20, 21.

2003 Douvilleiceras kawashitai Futakami, p. 240, figs 3a-e.

2008 Douvilleiceras alternans Casey, 1962; Latil, p. 258, pl. 2, figs 1-3.

2010 Douvilleiceras gr. orbignyi Hyatt, 1903; Matrion in Colleté, p. 182, text-fig. 128A-D.

2011 Douvilleiceras magnodosum Casey, 1962; Latil, p. 370, pl. 9, figs 10-13.

2013 Douvilleiceras alternans Casey, 1962; Klein & Bogdanova, p. 59 (with additional synonymy).

2013 Douvilleiceras inaequinodum (Quenstedt, 1846); Klein & Bogdanova, p. 61(with additional synonymy).

2013 Douvilleiceras magnodosum Casey, 1962; Klein & Bogdanova, p. 62 (with additional synonymy).

2013 Douvilleiceras orbignyi Hyatt, 1903; Klein & Bogdanova, p. 70 (with additional synonymy).

2013 Douvilleiceras pseudinaequinodum Collignon, 1963; Klein & Bogdanova, p. 71.

2014 Douvilleiceras inaequinodum (Quenstedt, 1849); Amédro, Matrion, Magniez-Jannin & Touch, pl. 10, fig. 5.

Type

The holotype is the original of Quenstedt 1849, pl. 10, fig. 1a, from the environs of Nice. The figure is reproduced by Spath (1925, text-fig. 15a on p. 74) and Casey (1962, text-fig. 95c on p. 9273)

Material

OUM KX4853, 4858, 4863, 4864, 4867, 4869, 4870, 4871, 4876, and 4877, from locality 53. OUM KX5808, from locality 142. OUM KX9949, from locality 175. OUM KX1006, from locality 176. OUM KX9891 from southwest ofN dumu.

Description

The best-preserved specimen, OUM KX4863 (Fig. 11F, G) is a phragmocone 63 mm in diameter, retaining recrystal-lized shell. Coiling is involute, the umbilical wall notched to accommodate the inner ventrolateral spines of the preceding whorl. The umbilicus is deep, and comprises 31% of the diameter, the umbilical wall feebly convex, the umbilical shoulder broadly rounded. The whorl section is depressed reniform in intercostal section, with a whorl breadth to height ratio of 1.44, the greatest breadth just below mid-flank. The penultimate whorl lacks an umbilical bulla on the adapical part. The inner ventrolateral tubercles bear long, septate spines. There are sixteen primary ribs on the outer whorl. They arise at the umbilical seam, and strengthen across the umbilical wall, developing into small umbilical bullae that strengthen progressively as size increases. A single broad, feebly prorsiradiate, progressively strengthening rib connects to a much stronger conical inner ventro-lateral tubercle, the base of a septate spine. A low broad rib connects to a massive outer ventrolateral tubercle, asymmetrically conical, and divided into three spirally elongated ridges by two grooves. The ridges become progressively stronger towards the mid-ventral region. A low, broad, transverse rib connects the tubercles across the venter, which is deeply concave in costal section. On the adapical half of the outer whorl, the ventral part of the rib is divided into an adapertural and adapical riblet by a median groove. A single intercalated rib is present on the ventrolateral shoulders and venter between the second and third, and third and fourth ribs from the adapertural end of the outer whorl.

The septate spines are particularly well preserved on OUM KX4864 (Fig. 11E). OUM KX5808 (Fig. 11D, H) has even more prominent outer ventrolateral tubercles, here divided into four spiral ridges by three spiral grooves; there are no intercalated ribs in this specimen. OUM KX4858 (Fig. 11I, J) is is interpreted as an adult microconch, with a 120° sector of body chamber, and a maximum preserved diameter of 78 mm. On the phragmocone, the outer ventrolateral tubercles are divided into four spiral ridges, and there is a single weak riblet intercalated between successive primaries. On the body chamber, the outer ventrolateral tubercles rapidly weaken, as do the umbilical bullae, leading to an ornament of alternating primary and intercalated ribs of only slightly different strengths, the primaries notched by three spiral grooves on the ventrolateral shoulder, producing four spiral ridges that strengthen progressively towards the mid-venter. OUM KX4876 (Fig. 12G, H), a worn fragment with a maximum preserved intercostal whorl height of 29 mm, has single well-developed intercalated ribs between successive primaries, one of them strengthened into feeble outer ventrolateral tubercles.

OUM KX10006 (Fig. 13I, J) is interpreted as an incomplete macroconch, 99 mm in diameter, with a 90° sector of body chamber. The cross section of the penultimate whorl reveals a deep ventral sulcus between outer ventrolateral bullae. On the phragmocone, the primary ribs bear small umbilical, and larger inner ventrolateral bullae, the bases of septate spines, partially preserved in places, together with small inner ventrolateral tubercles. Strong outer ventrolateral bullae (albeit weaker than on the outer whorl), are divided by three grooves into a smaller, rounded inner tubercle and three strong spiral ridges; the ventral sulcus is broad and of moderate depth, and crossed by a low, broad rib, in some cases differentiated into a pair of riblets. There are seven rows of tubercles on each rib. One or two intercalated ribs separate successive primaries. They may lack tubercles, or bear feeble outer ventrolateral bullae. The strong outer ventrolateral bulla on the primary ribs declines abruptly on the body chamber, leaving three rows of feeble tubercles.

Discussion

The figure of the holotype is a ventral view showing three strongly tuberculate ribs, the outer ventrolateral tubercles divided into four spiral ridges by three grooves, separated by two intercalated nontuberculate ribs. A single suture is indicated. Casey (1962, p. 281) separated Douvilleiceras inaequinodum (which he regarded as a typically Middle Albian species) from D. orbignyi (the neotype, designated by Casey, 1962, p.279, is the original ofBayle, 1878, pl. 60, fig. 4, from the condensed Albian of Machéroménil, Ardennnes, France, in the Collections of the École des Mines, now housed in the Université Claude Bernard, Lyon, and illustrated here as Fig. 5) on the basis ofthe presence oftwo rather than a single intercalated rib between successive stronglytu-berculate ribs in inaequinodum. As Cooper (1982, p. 284) has noted, some lower Middle Albian Douvilleiceras that he referred to inaequinodum have a single intercalated rib (1982, fig. 12C, D, G, H). Destombes (1979, pl. 6-4, figs 1, 2) illustrated (as D. orbignyi and D. inaequinodum) co-occurring individuals with one, two or three intercalated ribs, and Matrion (in Colleté 2010, fig. 128a-d) specimens he referred to as Douvilleiceras gr. orbignyi with single intercalated ribs and pairs of intercalated ribs. The number of intercalated ribs is regarded as a no more than intraspecific variation here, and we follow Cooper (1962) in drawing the species limits more widely than did Casey. The change on the adapical part of the adult body chamber from the hypernodose pre-adult stage to the predominantly ribbed adult stage with progressively weakening tubercles is striking, and much more pronounced than the same event in D. mammillatum. OUM KX4858 (Fig. J) is interpreted as an adult microconch, lacking most of the adult body chamber. The adult macroconch phragmocone is represented by the neotype of Douvilleiceras orbignyi Hyatt, 1903 (Text-fig. 5), and a specimen from Ford Place, Wrotham, Kent (Casey 1962, text-fig. 100 on p. 281), 150 mm in diameter, whilst OUM KX10006 (Fig. 13I, J) is interpreted as a smaller macroconch that preserves the change from phragmocone to body chamber. The holotype of Douvilleiceras benonae Besairie, 1936 (p. 164, pl. 15, figs 15, 16) was figured at half natural size. We have not seen the specimen, which appears to be an adult body chamber, with massive outer ventro-lateral horns on primary ribs, separated by a single non-tuberculate rib at the adapical end, thereafter increasing to five. This increase appears to be a character ofadult body chambers of the hypernodose Douvilleiceras, but the high number seen in benonae is distinctive. Collignon (1963, pl. 284, fig. 1244) figured a smaller fragment with six intercalated ribs between successive hypernodose primaries. Typical inaequinodum are, however, present in the Madagascan fauna: the original ofDouvilleiceras aff. baylei Spath of Collignon (1963, pl. 287, fig. 1248: Fig. 22C, D).

Douvilleiceras benonae Besairie of Tavani (1942, p. 120 (34), pl. 12 (3), fig. 11; pl. 14 (5), figs 1, 2, figs 1, 2) appears to be a crushed example of the present species.

The specimen of Douvilleiceras alternans from Machéro-ménil figured by Casey (1962, text-fig. 101 on p. 283) is an adult macroconch, showing the same ontogenetic changes in ornament on the body chamber as the incomplete microconch OUM KX4858 (Fig. J). Casey (1962, p. 282) noted that there were many transitions between D. orbignyi and D. alternans, and the differences he cites fall within intraspecific variation in our view.

Douvilleiceras magnodosum Casey, 1962 (p. 284, pl. 42, fig. 4; text-fig. 102) was based on two specimens only. The holotype, a 60° whorl sector was separated from D. alternans on the basis of a more depressed whorl section, unusually high position of the lateral tubercle on the flank, and in possessing two intermediary ribs between successive pairs of greatly exaggerated ventral tubercles at an earlier stage of growth stage. We regard this fragment as no more than an intraspecific variant of D. inaequinodum.

Douvilleiceras pseudinaequinodum Collignon, 1963 (p. 120, pl. 388, fig. 1249) is based on an individual 185 mm in diameter from the 'Albien Moyen' of Ambarimaninga (Mitsinjo-Namakia), Madagascar. Collignon described the ornament on the adapical part of the outer whorl as corresponding to that of D. inaequinodum, from which he differentiated it on the weakening of the larger tubercles on the adapertural part of the outer whorl. It is interpreted here as a macroconch D. inaequinodum.

Douvilleiceras charshangense Mirzoev, 1967 (p. 58, pl. 7, figs 1-5; text-figs 1-3) from the southern slopes of the Gissar Range in Tadjikistan, has a nucleus to a diameter of 55 mm that is close to the holotype of Douvilleiceras mammillatum var. baylei Spath, 1923 (p. 70), figured by Casey (1962, text-fig. 99b, c, on p. 280) as Douvilleiceras orbignyi.At larger diameters, the ornament weakens; it may be no more than a variant of D. inaequinodum.

The holotype of Douvilleiceras kawashitai Futakami, 2003 (p. 240, figs 3a-e, 4a) is very close to OUM KX4863 (Fig. 11G, H), and we regard it as a further synonym of D. inaequinodum.

Occurrence

As here interpreted, Douvilleiceras inaequinodum ranges from Upper Lower to lower Middle Albian. The geographic distribution extends from southern England to France, Poland, Tunisia, Angola, northern KwaZulu-Natal, Madagascar, northwest India (Rajastan), Japan, and Texas (?).

 

ACKNOWLEDGEMENTS

Kennedy acknowledges the support of the staff of the Geological Collections, Oxford University Museum of Natural History, and the Department of Earth Sciences, Oxford, and the financial assistance of the Oppenheimer Fund (Oxford). Klinger acknowledges support of the staff of the Natural History Collections Department of Iziko, South African Museum, and financial support from the NRF, South Africa. We thank Robin Marchand of the Musée Cantonal de Geologie de Lausanne for assistance in locating the surviving type material of Douvilleiceras invernoisi, and Stefan Ansermet for providing the originals of Fig. 23. The originals of Figs 1-3 were provided by P. Hurst of the photographic unit of the Natural History Museum, London. We thank F. Amédro for reviewing the manuscript.

 

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Received 23 June 2014.
Accepted 3 September 2014