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 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
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]