Psilocerataceae

Psilocerataceae Temporal range: Lower Jurassic PreꞒ Ꞓ O S D C P T J K Pg N
Family Arietitidae, Asteroceras stellare
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Suborder:	†Ammonitina
Superfamily:	†Psilocerataceae
Families
see text

Psilocerataceae is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida.

Psilocerataceae is probably derived from the Ussuritidae, which are found in the Phylloceratida, and combines five families, the Psiloceratidae, Echioceratidae, Schlotheimiidae, Arietitidae, and Oxynoticeratidae. The Psiloceratidae, which is the ancestral and type family, provides the basic description for the group.

Families Included

• Psiloceratidae - The Psiloceratidae are evolute, smooth or with blunt primary ribbing. The venter is rounded and generally smooth, in some feebly keeled. Sutures are simple with phylloid saddle endings in some. The aptychus is single, found in sutu in Psiloceras
• Echioceratidae
• Schlotheimiidae
• Arietitidae
• Oxynoticeratidae

References

• Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.