Gyrodus

Gyrodus (from Greek: γύρος gyros, 'curved' and Greek: ὀδούς odoús 'tooth')^[1] is an extinct genus of pycnodontiform ray-finned fish that lived from the middle Jurassic (Bajocian) to the middle Cretaceous (Barremian).^[2]

Gyrodus Temporal range: Bajocian–Barremian PreꞒ Ꞓ O S D C P T J K Pg N
Gyrodus hexagonus from Solnhofen, Germany
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Pycnodontiformes
Family:	Pycnodontidae
Genus:	Gyrodus Agassiz, 1843
Species
G. circularisAgassiz, 1833 G. cordillera Martill et al., 1998 G. cretaceus Agassiz, 1844 G. hexagonusde Blainville, 1818 G. huiliches Gouiric-Cavalli et al., 2019 G. milium Henry, 1876