Cheltonia

Cheltonia; Temporal range: Sinemurian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Oxynoticeratidae
Genus:	†Cheltonia; Buckman, 1904
Type species
	Ammonites accipitris; Buckman, 1844
Species
	Cheltonia accipitris Buckman, 1844; Cheltonia galeata Hoffmann, 1944; Cheltonia oustense Rakús & Guex, 2002;

Cheltonia is an extinct genus of ammonite from the Upper Sinemurian substage of Lower Jurassic of Europe, Africa, and America.^{[citation needed]} It is probably a microconch of genus Oxynoticeras.

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.

References

1 2 3 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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[Howarth2013-1] 1 2 3 M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.

[FWCheltonia-2] Cheltonia at Fossilworks.org