Orthaspidoceras

Orthaspidoceras Temporal range: Kimmeridgian PreꞒ Ꞓ O S D C P T J K Pg N
Fossil shell of Orthaspidoceras schilleri, on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Aspidoceratidae
Genus:	†Orthaspidoceras Spath 1925
Species
Orthaspidoceras lallerianum (d'Orb.), Orthaspidoceras schilleri (Opp.) Orthaspidoceras orthocera (d' Orb.).

Orthaspidoceras is an extinct ammonoid cephalopod genus belonging to the family Aspidoceratidae. These nektonic carnivores lived during the Jurassic period, Kimmeridgian age.

Description

Shells of Orthaspidoceras are medium or large-sized, with a diameter reaching about 20–25 centimetres (7.9–9.8 in). 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.

Distribution

Jurassic deposites of Italy, Mexico, Switzerland and Yemen.

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 Archived 2011-06-16 at the Wayback Machine
• Crioceratites
• Lithotheque.franceserv Archived 2016-03-03 at the Wayback Machine

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