Sinotitinae is one of three subfamilies of the Dimeroceratidae; a member of the Goniatitida, an extinctorder of ammonoid cephalopods from the Paleozoic. The two comprised genera, Sinutites and Sunites have broad, crescent shaped whorl sections, but one, Sinutites has a dorsal siphuncle while in the other, Sunites the siphuncle is ventral. References Sinotitinae entry on the Paleobiology Database 5/26/12 Dimeroceratidae Late Devonian first appearances Late Devonian animals Late Devonian extinctions