Epitainoceras Korn & Hairapetian, 2025, gen. nov.

Genus Epitainoceras gen. nov. urn:lsid:zoobank.org:act: 4F3AA6AC-9211-4B03-A581-9676BE734DAA New genus D – Korn 2025: 61. — Korn & Ghaderi 2025: 64, 72, 74. Type species Epitainoceras lutense gen. et sp. nov. Diagnosis Genus of the family Tainoceratidae with subinvolute or subevolute conch; whorl profile depressed and polygonal with a shallow or broad midventral longitudinal groove. Umbilical margin pronounced and narrowly rounded, flanks convergent. Sculpture with one row of nodes on the ventrolateral shoulder. Suture line strongly depending on the shape of the whorl profile, with rounded V-shaped external lobe and broadly rounded lateral lobe. Etymology From the Greek ‘ἐπί’=‘on, above’; referring to the late occurrence of this tainoceratid genus. Included species Transcaucasia (Abich 1878): Nautilus dorso plicatus Abich, 1878, Wuchiapingian, Azerbaijan. Central Iran (this paper): Epitainoceras lutense gen. et sp. nov., Wuchiapingian. Remarks Epitainoceras gen. nov. is a genus with a morphology similar to some species of Tainoceras, but with a much weaker sculpture. In contrast to Tainoceras, which has at least two rows of nodes or tubercles in the ventrolateral region and sometimes another row of nodes on the inner flank, Epitainoceras has only one row of nodes, located immediately adjacent to the median longitudinal groove on each side. With a simplification of the sculpture, the new genus may be derived from Tainoceras. Corotainoceras also shows simplification of the sculpture, but differs from Epitainoceras in the absence of ventrolateral nodes and the presence of very coarse dorsolateral nodes.