Cheltonia
Cheltonia is an extinct genus of ammonite from the Upper Sinemurian substage of Lower Jurassic of Europe, Africa,[2] and America. It is probably a microconch of genus Oxynoticeras.[1]
| Cheltonia | |
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| Genus: | Cheltonia Buckman, 1904 |
| Type species | |
| Ammonites accipitris Buckman, 1844 | |
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Description
Ammonites belonging to this genus had small platyconic shell, on which the last whorl has been eccentrically coiled. Ventral rostrum could be preceded by 3 to 5 crawlings. Umbilicus took about 30—40% of diameter. Ribs were falcoid and weak. Suture has been the same as in the case of young Oxynoticeras.[1]
References
- M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
- Cheltonia at Fossilworks.org
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