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
Temporal range: Sinemurian[1]
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
  • Ch. accipitris Buckman, 1844
  • Ch. galeata Hoffmann, 1944
  • Ch. oustense Rakús & Guex, 2002

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]

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References
  1. M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
  2. Cheltonia at Fossilworks.org


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