Eurynotoides


Eurynotoides is an extinct genus of prehistoric freshwater ray-finned fish in the family Eurynotoididae of the order Eurynotoidiformes. It is known from the mid-late Permian of south-central Russia.

Taxonomy

The genus was erected by Berg in 1940. In 1974, Sergienko described a new genus and species Heterolepis multa from the Middle Permian of Kemerovo Region, Russia, as a new member of the Palaeoniscidae family. However, Heterolepis was already in use for the extant snake Heterolepis capensis, making Sergienko's naming a junior homonym. In 2023, A. S. Bakaev reclassified "Heterolepis" multa into Eurynotoides as E. multa. This species is different from E. nanus and E. costatus by having ganoin peninsula-shaped structures on the anterior margin of the scale as well as by the presence of denticles on both posterior and lower edge of the scale.