Orthaspidoceras is an extinct ammonoid cephalopod genus belonging to the family Aspidoceratidae. These nektonic carnivores lived during the Jurassic period, Kimmeridgian age.Sepkoski, Jack 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.Jean-ours.filippi
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 Repartition et evolution du fenre Othaspidoceras Crioceratites Lithotheque.franceserv