''Peltoceras'' is an extinct
ammonite genus from the
aspidoceratid subfamily
Peltoceratinae that lived during the later part of the
Middle Jurassic (U
Callovian
In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 166.1 ± 4.0 Ma (million years ago) and 163.5 ± 4.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the ...
).
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.
Jurassic ammonites
Ammonites of Europe
Callovian life
Ammonitida genera
Aspidoceratidae
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