Kingdom Animalia Family Pachyceratidae Rank Genus Subclass Ammonites | Superfamily Perisphinctaceae Phylum Mollusca Order Ammonitida | |
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Similar Progeronia, Ammonites, Pseudothurmannia, Pleuroceras solare | ||
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.
References
Pachyceras Wikipedia(Text) CC BY-SA