Class Cephalopoda Superfamily Perisphinctaceae Rank Genus | Phylum Mollusca | |
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Benacoceras is a strongly ribbed, evolute ammonite from the Late Jurassic, coiled so that all whorls are exposed. Ribbing is biplicate, with very short secondaries. The venter, the outer rim, is smooth, at least on the outer whorl.
References
Benacoceras Wikipedia(Text) CC BY-SA