Family Sinoceratidae Shimizu & Obata, 1935

Diagnosis

Family of the order Lituitida with orthoconic or cyrtoconic apical part of the conch. Whorl profile elliptical to circular. Shell surface smooth or ornamented with growth lines and transverse lirae or striae; ventral sinus of ornament elements weakly developed. Siphuncle subcentral or central in position, septal necks orthochoanitic but sometimes cyrtochoanitic in the apical part (after Dzik 1984 and Kröger et al. 2007, emended).

Genera included

Rhynchorthoceras Remelé, 1882; Sinoceras Shimizu & Obata, 1935; Tyrioceras Strand, 1934 .