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
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