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African Natural History

On-line version ISSN 2305-7963
Print version ISSN 1816-8396

Afr. nat. history (Online) vol.6  Cape Town Jan. 2010


Tarrantites, a new heteromorph ammonite genus from the Albian of Texas and Pakistan



Herbert Christian KlingerI; William James KennedyII; Keith P. MinorIII

INatural History Collections Department, Iziko South African Museum, P.O. Box 61, Cape Town, 8000 South Africa and Department of Geological Sciences, University of Cape Town, Private Bag, Rondebosch, 7701 South Africa. E-mail:
IIOxford University Museum of Natural History, Parks Road, Oxford 0X1 3PW, U.K. E-mail:
IIITexas Research Institute, Austin, 415 Crystal Creek Drive, Austin TX78746, U.S.A. E-mail:




A new heteromorph ammonite genus, Tarrantites, is proposed for Hamites adkinsi Scott, 1928. The description of the new genus is based mainly on a near-complete specimen from the Middle Albian part of the Goodland Limestone of Tarrant County, Texas, the holotype, and on an abraded mould on a pebble from the bed of a stream in Hill County, Texas. In addition, we record the presence of the genus in the Albian of Pakistan. Tarrantites shows a remarkable resemblance to the labeceratine genera Labeceras Spath, 1925 and Myloceras Spath, 1925: in coiling and size to the former, and in ornamentation to the latter, but is excluded from the subfamily Labeceratinae Spath, 1925, because it has a distinct bifid adventive (A) lobe. This latter feature, and the ornamentation, rather suggest affinities of Tarrantites with the family Anisoceratidae Hyatt, 1900.

Keywords: Albian, heteromorph ammonite, Tarrantites, Anisoceratidae, labeceratine homoeomorph, Texas, Pakistan.



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We thank Arthur Busbey at the Department of Geology at Texas Christian University for loan of the specimens TCU1046 and TCU1144. We also thank Ann Molineux at the Texas Natural Science Center at the University of Texas at Austin for loan of the specimen NPL19654. Klinger thanks the National Research Foundation, South Africa, for financial assistance. Kennedy acknowledges the technical support of the staff of the Department of Earth Sciences, Oxford and the Oxford University Museum of Natural History.



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Received 12 March 2010
Accepted 30 March 2010

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