Orthaspidoceras
Orthaspidoceras Temporal range: {{Kimmeridgian}} | |
---|---|
Fossil shell of Orthaspidoceras schilleri, on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
Scientific classification | |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | Ammonoidea |
Order: | Ammonitida |
Superfamily: | Perisphinctoidea |
Family: | Aspidoceratidae |
Genus: | Orthaspidoceras Spath 1925 |
Orthaspidoceras is an extinct ammonoid cephalopod genus belonging to the family Aspidoceratidae.
These nektonic carnivores lived during the Jurassic period, Kimmeridgian age.[1]
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.[2]
Species
- Orthaspidoceras lallerianum (d'Orb.),
- Orthaspidoceras schilleri (Opp.)
- Orthaspidoceras orthocera (d' Orb.).
References
- ↑ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
- 1 2 Jean-ours.filippi
- 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
This article is issued from Wikipedia - version of the 10/10/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.