''Plethodus'' is an extinct genus of prehistoric

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...

. It is the

type genus In biological taxonomy, the type genus (''genus typica'') is the genus which defines a biological family and the root of the family name. Zoological nomenclature According to the International Code of Zoological Nomenclature, "The name-bearin ...

of the family

Plethodidae Plethodidae is an extinct Family (biology), family of Teleostei, teleost fish that existed during the Late Cretaceous period. Fossils are known from North America, North Africa, and Europe. Description Plethodids possessed thin, Pomacanthidae, ...

. Fossils are mostly known from

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

, but specimens have recently been identified from

Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...

References

Cretaceous bony fish Prehistoric ray-finned fish genera Tselfatiiformes Cretaceous fish of Africa {{Crossognathiformes-stub Fossil taxa described in 1850