Cheltonia
Cheltonia Temporal range: Sinemurian[1] | |
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Scientific classification | |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | Ammonoidea |
Superfamily: | Psiloceratoidea |
Family: | Oxynoticeratidae |
Genus: | Cheltonia Buckman 1904 |
Type species | |
Ammonites accipitris Buckman, 1844 | |
Species | |
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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]
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
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