Pachyceras

Pachyceras is a genus of perisphinctoid ammonites from the Middle Jurassic, upper Callovian stage, and is the type genus for the family Pachyceratidae. The shell is involute, subglobular, with a deep umbilicus and flattened flanks that slope toward a more narrowly rounded venter, and covered by low, widely spaced ribs.

Pachyceras
Temporal range: Callovian–Oxfordian[1]
Fossil of Pachyceras lalandeanum from Calvados (France), on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Pachyceratidae
Genus:
Pachyceras

Bayle, 1878
Species [2]
  • Pachyceras schloenbachi Roman, 1930

Distribution

Jurassic deposits of Egypt, France, India, Saudi Arabia and Switzerland.[2]

References
  1. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Archived from the original on 2016-02-25. Retrieved 2017-10-18.
  2. Paleobiology Database - Pachyceras. 2017-10-18.
  • D. T. Donovan, J. H. Callomon and M. K. Howarth 1981. Classification of the Jurassic Ammonitina; The Ammonoidea. The Systematics Association special volume no. 18


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