Tainoceratoidea

The Tainoceratoidea are a superfamily in the cephalopod order Nautilida characterized by straight to loosely coiled shells, generally to a degree such that the width is greater than the height, to quadrate whorl section. Many bore spines, ribs, frills, wings, or nodes. In early forms, the siphuncle is generally near ventral, but more variable (usually central) in advanced forms.

Tainoceratoidea Temporal range:
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	Nautilida
Superfamily:	†Tainoceratoidea Hyatt, 1883
Families
Koninckioceratidae Rhiphaeoceratidae Rutoceratidae Tainoceratidae Tetragonoceratidae

Tainoceratoids are derived from the Oncocerida through the Rutoceratidae which first appear in the Lower Devonian. The Rutoceratidae gave rise to the exclusively Devonian Tetragonoceratidae and early on the Mississippian or late the Devonian to the Tainoceratidae and Koninckioceratidae. The Tainoceratidae gave rise to the Rhiphaeoceratidae which are confined to the Permian.

The Tainoceratoidea, established by Alpheus Hyatt in 1883, are equivalent for most purposes to the suborder Rutoceratina established later by Shimanskiy in 1957.

References

• Kummel 1964. Nautilioidea - Nautilida, in the Treatise on Invertebrate Paleontology, Part K Nautiloidea, Geological Society of America and University of Kansas press. (K383-K387; K413)