Ataxioceratidae is an extinct

Ammonite Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...

cephalopod family included in the superfamily

Perisphinctoidea Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic (Bajocian) to Lower Cretaceous (Barremian) Ammonitina, ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before cro ...

. These fast-moving nektonic carnivores lived during the

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. ...

and

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 ...

periods.

Genera

*'' Catutosphinctes'' *'' Choicensisphinctes'' *'' Katroliceras'' *'' Lithacoceras'' *'' Lithacosphinctes'' *''

Orthosphinctes ''Orthosphinctes'' is a genus of ammonites belonging to the order Ammonitida family Ataxioceratidae. They lived in the late Jurassic period, in the Kimmeridgian age, which occurred 155.7-152.1 million years ago. These shelled ammonoids were ne ...

Distribution

Fossils of species within this genus have been found in the Cretaceous of Yemen, as well as in

sediments of Antarctica, Argentina, Canada, China, Cuba, France, Germany, Hungary, India, Iran, Italy, Madagascar, Nepal, Somalia, Spain, United States.

References

Ammonitida families Perisphinctoidea Jurassic ammonites Cretaceous ammonites Oxfordian first appearances Early Cretaceous extinctions {{Ammonitina-stub