African Natural History
On-line version ISSN 1816-8396
KLINGER, Herbert Christian; KENNEDY, William James and MINOR, Keith P.. Tarrantites, a new heteromorph ammonite genus from the Albian of Texas and Pakistan. Afr. nat. history (Online) [online]. 2010, vol.6, pp. 91-99. ISSN 1816-8396.
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.