Cheltonia is an extinct genus of ammonite from the Upper Sinemurian substage of Lower Jurassic of Europe, Africa,[2] and America.

[citation needed] It is probably a microconch of genus Oxynoticeras.

[1] 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.

Suture has been the same as in the case of young Oxynoticeras.