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Eurynotoides; Temporal range: 272.3–265 Ma PreꞒ Ꞓ O S D C P T J K Pg N Permian
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	†Eurynotoidiformes
Family:	†Eurynotoididae
Genus:	†Eurynotoides; Berg, 1940
Species
	†Eurynotoides costatus Eichwald, 1861; †Eurynotoides multa Sergienko, 1974; †Eurynotoides nanus Eichwald, 1861;
Synonyms
	Heterolepis Sergienko, 1974;

Eurynotoides is an extinct genus of prehistoric bony fish^[1] in the family Eurynotoididae of the order Eurynotoidiformes.^[2]

Taxonomy

The genus was erected by Berg in 1940. In 1974, Sergienko described a new genus and species Heterolepis multa from the Middle Permian (Kazanian) 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 redescribed "Heterolepis" multa as a new species in the genus Eurynotoides, 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]