Nautiloidea

The nautiloids, subclass Nautiloidea, includes the living Nautilus, and several extinct orders of cephalopods. The orthoconic nautiloids with straight shells, called orthocones, are a paraphyletic group. For more information, visit the Wikipedia entry. Get back to Cephalopoda
† Cameroceras	† Cooperoceras	Nautilus
† Orthoceras	† Rayonnoceras