Tofangoceras

Tofangoceras Temporal range: middle Ordovician
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Order:	Pseudorthocerida
Family:	Stereoplasmoceratidae
Genus:	Tofangoceras Kobayashi, 1927

Tofangoceras is a genus of pseudorthoceroid cephalopods from the Middle Ordovician of the USA (NY) and Asia (S. Manchuria, Korea, and Siberia) belonging to the Stereoplasmoceratidae and similar to Stereoplansmoceras .

The shell of Tofangoceras is long, straight, and faintly annulated, less strongly than for Stereoplasmoceras. The siphuncle is central with moderately expanded, spindle-like segments. Aperture unknown.

References

• Walter C. Sweet, 1964. Nautiloidea - Orthocerida; Treatise on Invertebrate Paleontology, Part K mollusca 3. Geological Society of America and University of Kansas Press.