Corotainoceras Korn & Ghaderi, 2025, gen. nov.

Genus Corotainoceras gen. nov. urn:lsid:zoobank.org:act: F415 AD 8C-A2F7-4191-809F-FDC1796B0974 New genus F – Korn 2025: 61. Type species Corotainoceras inerme gen. et sp. nov. Diagnosis Genus of the family Tainoceratidae with subevolute conch; whorl profile depressed and polygonal with a shallow midventral longitudinal groove. Umbilical margin broadly rounded, flanks convergent. Sculpture without nodes on the venter and the ventrolateral shoulder, but with coarse umbilical nodes. Suture line strongly depending on the shape of the whorl profile, with shallow, rounded V-shaped external lobe and broadly rounded lateral lobe. Etymology Combination of the Latin ‘ corona ’ (noun)=‘wreath’ and Tainoceras; because of the coronate umbilicus. Included species NW Iran (this paper): Corotainoceras inerme gen. et sp. nov., Wuchiapingian. Remarks The genera of the family Tainoceratidae are generally distinguished on the basis of their sculpture. The new genus differs from all other genera of the family in the absence of ventral and ventrolateral nodes or tubercles. In contrast to most other members of the family Tainoceratidae, the type species of Corotainoceras shows very coarse umbilical nodes.