''Gyrodus'' (from , 'curved' and 'tooth') is an

extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

pycnodontiform Pycnodontiformes is an extinct order of primarily marine bony fish. The group first appeared during the Late Triassic and disappeared during the Eocene. The group has been found in rock formations in Africa, Asia, Europe, North and South America. ...

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...

that lived from the middle

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...

(

Bajocian In the geologic timescale, the Bajocian is an age and stage in the Middle Jurassic. It lasted from approximately 170.9 ±0.8 Ma to around 168.2 ±1.2 Ma (million years ago). The Bajocian Age succeeds the Aalenian Age and precedes the Bathonia ...

) to the middle

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

(

Barremian The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 125.77 Ma (million years ago) and 121.4 ± 1.0 Ma (Historically, this stage was placed at 129.4 million to approximately 125 million years ago) It is a ...

References

* ''Fossils'' (Smithsonian Handbooks) by David Ward {{Taxonbar, from=Q1092164 Pycnodontiformes genera Jurassic bony fish Cretaceous bony fish Cretaceous fish of Africa Fossils of Egypt Fossils of Tunisia Cretaceous United Kingdom Fossils of England Jurassic France Fossils of France Jurassic Germany Fossils of Germany Jurassic Spain Fossils of Spain Cretaceous fish of North America Cretaceous Canada Fossils of Canada Jurassic fish of Europe Cretaceous fish of Europe Jurassic fish of South America Cretaceous fish of South America Cretaceous Argentina Fossils of Argentina Jurassic Chile Cretaceous Chile Fossils of Chile Fossil taxa described in 1843 Taxa named by Louis Agassiz

References

Further reading