Caumontisphinctes is an ammonoid genus from the ammonitid superfamily Perkinsonatoidea that lived during the Bajocian stage of the Middle Jurassic.[1]
Chaumontisphinctis, named by Buckman, is like the genus Perisphinctis in being compressed with an ovoid whorl section but perkinsoniid in having sharp ribbing, a smooth or grooved venter, and tubercles commonly developed at bifurcation points on the ribs and at the ventral edge or on the venter.