''Orthaspidoceras'' is an extinct ammonoid cephalopod genus belonging to the family Aspidoceratidae. These nektonic carnivores lived during the

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...

period,

Kimmeridgian In the geologic timescale, the Kimmeridgian is an age in the Late Jurassic Epoch and a stage in the Upper Jurassic Series. It spans the time between 154.8 ±0.8 Ma and 149.2 ±0.7 Ma (million years ago). The Kimmeridgian follows the Oxfordian ...

age.Sepkoski, Jac
Sepkoski's Online Genus Database – Cephalopoda

Description

Shells of ''Orthaspidoceras'' are medium or large-sized, with a diameter reaching about . These shells are relatively involute and thick, with a quadrate-rounded or depressed whorls. The ornamentation consists of a row of coarse tubercles and fine streaks.
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Distribution

Jurassic deposites of Italy, Mexico, Switzerland and Yemen.Paleobiology Database – Orthaspidoceras
2014-05-29.

References

* Arkell, et al.,1957. Mesozoic Ammonoidea;

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...

, Part L (Ammonoidea). Geol Soc of America and Univ Kansas Press. p. L338-339.

External links

Repartition et evolution du fenre Othaspidoceras

Lithotheque.franceserv
Jurassic ammonites Fossils of Italy Fossils of Mexico Kimmeridgian life Ammonitida genera Aspidoceratidae {{Ammonitina-stub