The Sinoceratidae is a family of orthoceroids, named for the genus '' Sinoceras'', both by Shimizu and Obata 1935, and equivalent to the Michelinoceratinae Flower, 1945. The Sinoceratidae are characterized by relatively long septal necks in the siphuncle, reaching as much as halfway between septa in the chambers; sparse cameral deposits and apparently none within the siphuncle. The inclusion of the Sinoceratidae in some classifications in the Lituitida instead of the Orthocerida is based in part on the idea that the

Lituitidae The Lituitidae are a family of evolved Tarphycerida, tarphycerids characterized by a long orthoconic section that follows a coiled juvenile portion at the apex, along with a generally tubular siphuncle, which like that of the Tarphycerida, barran ...

are included in the Orthocerida rather than as originally perceived in the

Tarphycerida The Tarphycerida were the first of the coiled cephalopods, found in marine sediments from the Lower Ordovician (middle and upper Canad) to the Middle Devonian. Some, such as '' Aphetoceras'' and '' Estonioceras'', are loosely coiled and gyroconi ...

References

* Rousseau H Flower, 1962. Notes on the Michelinoceratida. Memoir 10, Part II. New Mexico Bureau of Mines and Mineral Resources. Socorro NM. * Walter C. Sweet, 1964. Nautiloidea-Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geol. Soc. of America and Univ. Kansas Press. Orthocerida Early Ordovician first appearances Late Triassic extinctions Prehistoric cephalopod families {{paleo-cephalopod-stub