Asteroceras obtusum
Asteroceras obtusum, 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.
Asteroceras obtusum | |
---|---|
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 |
Order: | †Ammonitida |
Family: | †Arietitidae |
Genus: | †Asteroceras |
Species: | †A. obtusum |
Binomial name | |
†Asteroceras obtusum Sowerby, 1817 | |
Description
Asteroceras obtusum 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]
gollark: ÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆA, yes.
gollark: ÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆ?
gollark: I don't think so. Blame my ISP perhaps.
gollark: Odd. I'll connect it to voice.
gollark: Broken how?
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
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.