Protacanthopterygii
Sign in to saveProtacanthopterygii 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.
Species
原棘鳍亚群（学名：Protacanthopterygii）或原棘鳍总目是辐鳍鱼纲的一个演化支，包括了鲑形目与其近亲，本类鱼类的棘鳍不发达，有的只有弱棘。
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Article
4 sectionsContents
- Characteristics and origin
- Systematics
- Phylogeny
- References
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.
==Characteristics and origin== The Protacanthopterygii contain a number of moderately advanced teleosts. Anatomical and other traits commonly found in this superorder are: more than 24 vertebrae, epicentral cartilages, one supraorbital bone, and a mesocoracoid, an adipose fin, and (often prominent) glossohyal teeth. However, they usually lack a protrusible upper jaw, a gular plate, and proximal forking of the intermuscular bones. Most members of this taxon are rather specialized mid-sized to larger predators of smaller animals.