''Orthaspidoceras'' is an extinct ammonoid cephalopod genus belonging to the family

Aspidoceratidae The Aspidoceratidae comprise a family of middle and upper Jurassic ammonites that make up part of the superfamily Perisphinctoidea, characterized by evolute shells, commonly stocky, that tend to develop tubercles. The Aspidoceratidae are thought ...

. 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 Mya. The J ...

period, Kimmeridgian 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.
/ref>

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

External links

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