Pachydiscidae is a family of middle and upper Cretaceous

ammonites 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 ...

in the superfamily

Desmoceratoidea Desmoceratoidea, formerly Desmocerataceae, is a superfamily of Cretaceous ammonites, generally with round or oval-whorled shells that are mostly smooth or weakly ribbed and rarely tuberculate, but commonly with constrictions.Desmoceratidae Desmoceratidae is a Family (biology), family belonging to the ammonite superfamily Desmoceratoidea. with and (1996), ''Mollusca 4 Revised , Cretaceous Ammonoidea'', vol. 4, in ''Treatise on Invertebrate Paleontology'', Part L (Roger L. Kaesl ...

by strong ribbing at some growth stage, that normally crosses the venter uninterrupted, and by the tendency to develop strong tuberculation, at least on the umbilical shoulder. Pachydischidae evolved from Desmoceratidea, during the Lower Cenomanian, about the same time as the Kossmaticeratidae; however, they lived further into the Maastrichtian, virtually to the end of the Cretaceous.

Genera

* '' Anapachydiscus'' Yabe and Shimizu, 1926 * '' Baskaniceras'' Wright and Kennedy, 1984 * '' Canadoceras''

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, 1922 * '' Eopachydiscus'' Wright, 1955 * '' Eupachydiscus'' Spath, 1922 * '' Lewesiceras'' Spath, 1939 * '' Menuites'' Spath, 1922 * '' Nowakites'' * ''

Pachydiscus ''Pachydiscus'' is an extinct genus of Ammonitina, ammonite from the Late Cretaceous and Early Paleocene with a worldwide distribution, and type (biology), type for the desmoceratacean family Pachydiscidae. The genus' type species is ''P. neuberg ...

'' Zittel, 1884 * '' Urakawites'' Matsumoto, 1955

Distribution

Fossils of Pachydiscidae are found in the

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 ...

marine strata throughout the world, including

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and

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References

* Mesozoic Ammonoidea.

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...

, Part L (1957), p L377-L380. Geological Society of America.
Paleobiology Database
{{Taxonbar, from=Q3360140 Desmoceratoidea Ammonitida families Cenomanian first appearances Maastrichtian extinctions