Protacanthopterygii

Protacanthopterygii
Ayu (Plecoglossus altivelis: Osmeriformes) in Kawasaki (Kanagawa Prefecture, Japan)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Cohort:	Euteleostei
Superorder:	Protacanthopterygii
Orders
Argentiniformes Esociformes Galaxiiformes Salmoniformes Osmeriformes? Stomiiformes? Ateleopodiformes? Alepocephaliformes? Myctophiformes? Aulopiformes? Lepidogalaxiiformes?

Protacanthopterygii is a superorder of ray-finned fish. They inhabit both marine and freshwater habitats. They appear to have evolved in the Cretaceous or perhaps late Jurassic, originating probably roughly 150 million years ago; fossils of them and the closely related Otocephala are known from throughout the Cretaceous.^[1]