Eurynotoides

Eurynotoides is an extinct genus of prehistoric freshwater ray-finned fish^[1] in the family Eurynotoididae of the order Eurynotoidiformes. It is known from the mid-late Permian of south-central Russia.^[2][3]

Eurynotoides Temporal range: Middle Permian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	†Eurynotoidiformes
Family:	†Eurynotoididae
Genus:	†Eurynotoides Berg, 1940
Species
†E. costatus (Eichwald, 1861) †E. multa (Sergienko, 1974) †E. nanus (Eichwald, 1861)
Synonyms
Heterolepis Sergienko, 1974

Taxonomy

The genus was erected by Berg in 1940. In 1974, Sergienko described a new genus and species Heterolepis multa from the Middle Permian (Roadian to Wordian)^[3] of Kemerovo Region, Russia, as a new member of the Palaeoniscidae family. However, Heterolepis was already in use for the extant snake Heterolepis capensis (Smith, 1847), 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.^[2]

See also

• Paleontology portal
• Fish portal

• Prehistoric fish
• List of prehistoric bony fish