{{Short description|Extinct family of ammonites}} {{No footnotes|date=August 2024}} {{Automatic taxobox | fossil_range = {{fossilrange|99.6|66}} Cenomanian - Maastrichtian | image = Pachydiscidae - Eupachydiscus isculensis.JPG | image_caption = ''Eupachydiscus isculensis'' from Cretaceous – Bergamo (Italy) | taxon = Pachydiscidae | authority = Spath, 1922 | subdivision_ranks = Genera | subdivision = See text }}
'''Pachydiscidae''' is a family of middle and upper Cretaceous ammonites in the superfamily Desmoceratoidea.
==Morphology== Pachydiscidae species are moderate to large in size, evolute to rather involute, and vary in section from inflated and depressed to high-whorled and compressed. They are distinguished from the Desmoceratidae 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.{{citation needed|date=August 2017}}
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'' <small>Yabe and Shimizu, 1926</small> * ''Baskaniceras'' <small>Wright and Kennedy, 1984</small> * ''Canadoceras'' <small>Spath, 1922</small> * ''Eopachydiscus'' <small>Wright, 1955</small> * ''Eupachydiscus'' <small>Spath, 1922</small> * ''Lewesiceras'' <small>Spath, 1939</small> * ''Menuites'' <small>Spath, 1922</small> * ''Nowakites'' * ''Pachydiscus'' <small>Zittel, 1884</small> * ''Urakawites'' <small>Matsumoto, 1955</small>
==Distribution== Fossils of Pachydiscidae are found in the Cretaceous marine strata throughout the world, including Angola, Antarctica, Armenia, Australia, Austria, Belgium, Brazil, Bulgaria, Chile, Czech Republic, Denmark, France, Germany, Haiti, India, Jamaica, Japan, Mexico, Netherlands, Nigeria, Oman, Russia, South Africa, Spain, Turkey, United States and Uzbekistan.
==References== {{Reflist}} * Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L (1957), p L377-L380. Geological Society of America. * [https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=82577 Paleobiology Database]
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Category:Desmoceratoidea Category:Ammonitida families Category:Cenomanian first appearances Category:Maastrichtian extinctions