Pachydiscidae is a family of middle and upper Cretaceous

ammonites Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

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 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. Kaesler et el. eds.), ...

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, but lived further into the Maastrichtian, virtually to the end of the Cretaceous.

Genera

* '' Anapachydiscus'' Yabe and Shimizu, 1926 * '' Baskaniceras'' Wright and Kennedy, 1984 * '' Canadoceras'' Spath, 1922 * '' Eopachydiscus'' Wright, 1955 * ''

Eupachydiscus ''Eupachydisus'' is a large, coarse-ribbed Pachydiscid ammonite genus from the Upper Cretaceous, found in Coniacian to Campanian age strata in Europe, Madagascar, Japan, and British Columbia. The whorl section in ''Eupachydiscus'' is inflated ...

'' Spath, 1922 * '' Lewesiceras'' Spath, 1939 * '' Menuites'' Spath, 1922 * '' Nowakites'' * ''

Pachydiscus ''Pachydiscus'' is an extinct genus of ammonite from the Late Cretaceous and Early Paleocene with a worldwide distribution, and type for the desmoceratacean family Pachydiscidae. The genus' type species is ''P. neubergicus''. Altogether some 28 s ...

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

Distribution

Fossils of Pachydiscidae are found in the

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of th ...

marine strata throughout the world, including

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References

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