Asteroceras obtusum
| Asteroceras obtusum Temporal range: Sinemurian | |
|---|---|
 | |
| Fossil of Asteroceras obtusum from Lyme Regis, on display at Museo di Scienze Naturali Enrico Caffi, Bergamo | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Family: | Arietitidae |
| Genus: | Asteroceras |
| Species: | A. obtusum |
| Binomial name | |
| Asteroceras obtusum Sowerby, 1817 | |
Asteroceras obtusym, the Obtuse Star Ammonite, is an extinct species of cephalopod belonging to the Ammonite subclass and to the family Arietitidae. These fast-moving nektonic carnivores lived during the lower Jurassic period, upper Sinemurian, around 189-196 million years ago
Description
Asteroceras obtusym has a shell reaching a diameter of about 8–20 centimetres (3.1–7.9 in).[2]
Distribution
Fossils of this species may be found in Mexico, Russia, France, Germany (Aalen) and United Kingdom, at Lyme Regis in the Asteroceras obtusum zone of Upper Sinemurian age[3][4][5][6][7]
References
- ↑ Sepkoski, Jack Sepkoski's Online Genus Database
- ↑ Ammonites
- ↑ Martell, D. M. 1995. An Ichthyosaur with Preserved Soft Tissue from the Sinemurian of Southern England. Palaeontology. 38(4): 897-903
- ↑ Paleobiology Databases
- ↑ Biolib
- ↑ Mikhail Semenovich Mesezhnikov, Gerd Ernst Gerold Westermann The Jurassic Ammonite Zones of the Soviet Union, Edizione 223
- ↑ Claudio Bartolini, James Lee Wilson, Timothy Frost Lawton Mesozoic Sedimentary and Tectonic History of North-central Mexico, Edizione 340
External links
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