Gyrodus

Gyrodus is an extinct genus of pycnodontiform ray-finned fish that lived from the late Triassic (Rhaetian) to the middle Cretaceous (Cenomanian).

Gyrodus Temporal range: Rhaetian-Cenomanian ~205.6–94.3 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Gyrodus hexagonus from Kelheim, Germany
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Pycnodontiformes
Family:	Pycnodontidae
Genus:	Gyrodus Agassiz 1843
Species
G. circularis G. cordillera Martill et al. 1998 G. cretaceus Agassiz 1844 G. hexagonus G. huiliches Gouiric-Cavalli et al. 2019 G. milium Henry 1876

Distribution

Fossils of Gyrodus have been found in:[1]

Triassic

• Franche-Comté, France

Jurassic

• Quehita and Quebrada Formations, Chile
• Canjuers-Les Bessons quarry and Fumel, France
• Painten Formation and Liegende Bankkalk Formation, Germany
• Sot de Chera Formation, Spain
• Calcareous Grit Formation, England

Cretaceous

• Agrio Formation, Argentina
• Ashville Formation, Canada
• Zapata Formation, Chile
• Baharîje Formation, Egypt
• Douiret Formation, Tunisia
• West Melbury Marly Chalk Formation, England

Gallery

• 
  Gyrodus hexagonus
• 
  Gyrodus circularis

References

1. Gyrodus at Fossilworks.org

Further reading

• Fossils (Smithsonian Handbooks) by David Ward