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 ray-finned fish taxon ranked as a superorder of the infraclass Teleostei. 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]