Orthaspidoceras

Orthaspidoceras is an extinct ammonoid cephalopod genus belonging to the family Aspidoceratidae. These nektonic carnivores lived during the Jurassic period, Kimmeridgian age.[2]

Orthaspidoceras
Temporal range: Kimmeridgian
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
Order:
Ammonitida
Family:
Aspidoceratidae
Genus:
Orthaspidoceras

Spath 1925
Species [1]
  • Orthaspidoceras lallerianum (d'Orb.),
  • Orthaspidoceras schilleri (Opp.)
  • Orthaspidoceras orthocera (d' Orb.).

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.[1]

Distribution

Jurassic deposites of Italy, Mexico, Switzerland and Yemen [3]

References
  1. Jean-ours.filippi
  2. Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
  3. Paleobiology Database – Orthaspidoceras. 2014-05-29.
  • Arkell, et al.,1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L (Ammonoidea). Geol Soc of America and Univ Kansas Press. p. L338-339.


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