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Cymaceras

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Cymaceras
Temporal range: Kimmeridgian[1]
Scientific classification
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Cymaceras

Quenstedt, 1887

Cymaceras is a genus within the oppeliid subfamily Ochetoceratinae from the Kimmeridgian stage, around the middle of the Upper Jurassic.[2]

Cymaceras is rather unusual in its wavy keel that leans alternatingly to one side then the other. Shells are involute, compressed, with a narrow venter and distinct inner and outer ribs, both sets of which are curved in a concave forward fashion.

References

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Notes
  1. ^ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on 2016-02-25. Retrieved 2017-10-18.
  2. ^ "Paleobiology Database - Cymaceras". Retrieved 2017-10-19.
Bibliography

W.J. Arkell, et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleongology, Part L. Geological Society of America and University of Kansas Press.