Tornoceras is a strongly involute, subdiscoidal Middle and Upper Devonian goniatite with a suture that forms six to ten lobes.

[1] Tornoceras is an extinct genus of cephalopods that shares similarities with the modern pearly nautilus.

The shell is circular and relatively flat, with the final whorl enveloping the previous ones.

The sutures between the successive chambers of the shell exhibit a gently rippled pattern.

[2] Aulatornoceras, Protornoceras, Epitornoceras, Lobotornoceras are among related genera included in the Tornoceratidae.