Sinoceras
Introduction '''''Sinoceras''''' is an extinct genus of nautiloids from China included in the family Orthoceratidae that lived from the middle Ordovician until the Devonian. The type species, ''S. chinense'', was originally described as "''Orthoceras chinense''," but then was promoted by Shimizu and Obata to its own genus, ''Sinoceras'', in 1935.The shell of ''Sinoceras'' is like ''Michelinoceras'' in that it has a slender orthoconic shell but the camerae are shorter and septal necks proportionally longer, reaching nearly a third the camera length. The surface in some is marked either by very fine irregular striae or by sinuous transverse growth bands. Doubtfully distinct from ''Michelinoceras''.
References * Sweet, Walter C. 1964.Nautiloidea-Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc of America, and Univ Kansas Press. * Sepkoski, J.J. Jr. 2002.A compendium of fossil marine animal genera. D.J. Jablonski & M.L. Foote (eds.). ''Bulletins of American Paleontology'' '''363''': 1–560. : see List of nautiloids