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:
Fossil shell of Orthaspidoceras schilleri, on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification
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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


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