Gyrodus

Gyrodus Temporal range: Jurassic - Cretaceous

Gyrodus hexagonus from Kelheim, Germany.
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Pycnodontiformes
Family:	Pycnodontidae
Genus:	Gyrodus

Gyrodus is an extinct genus of pycnodontiform ray-finned fish that lived in the Jurassic and Cretaceous.