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Tofangoceras : ウィキペディア英語版 | Tofangoceras ''Tofangoceras'' is a pseudorthoceroid cephalopod 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 segmeents. 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.
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