Peltoceras

Peltoceras is an extinct ammonite genus from the aspidoceratid subfamily Peltoceratinae that lived during the later part of the Middle Jurassic (U Callovian).[1]

Peltoceras
Temporal range: Callovian[1]
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Peltoceras solidum from the Matmor Formation (Jurassic, Callovian) in Makhtesh Gadol, Israel.
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Suborder:
Ammonitina
Superfamily:
Perisphinctoidea
Family:
Aspidoceratidae
Subfamily:
Peltoceratinae
Genus:
Peltoceras

The shell of Peltoceras is evolute with whorls hardly embracing, so that all whorls are mostly exposed. The outer rim, which is known as the venter, aligning with the lower part or belly of the animal, is nearly flat. Inner whorls have strong ribs that bifurcate and trifurcate on the ventral margin. The outer whorls have large simple ribs and two rows of massive lateral tubercles, the outer row developing first.

References
  • Arkell, et al., 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L. (Ammonoidea) p. L335-336. Geol Soc of America and Univ Kansas Press.
  1. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2017-10-18.


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