Arietites
| Arietites Temporal range: Sinemurian[1] | |
|---|---|
 | |
| Arietites bucklandi | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Order: | Ammonitida |
| Superfamily: | Psilocerataceae |
| Family: | Arietitidae |
| Genus: | Arietites Waagen, 1869 |
Arietites is a genus of massive, giant evolute, psiloceratacean ammonites in the family Arietitidae in which whorls are subquadrate and transversely ribbed and low keels in tripicate, separated by a pair of longitudinal grooves, run along the venter. Fossils are known world wide from the lower Sinemurian stage of the Lower Jurassic.
Arietites bucklandi fossil at the Geological Museum in Copenhagen
Similar genera include Megarietites in which the keels are reduced and Epammonites in which the ribs are more closely spaced.
References
- ↑ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
- Arkell, et al. 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology. Geological Soc. of America and Univ. of Kansas Press.
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