Sinotitinae is one of three

subfamilies In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end botanical subfamily names with "-oideae", and zool ...

of the

Dimeroceratidae Dimeroceratidae is one of three families in the Dimeroceratoidea, a goniatid superfamily included in the Ammonoidea; extinct shelled cephalopods with adorally convex septa and usually narrow ventro-marginal siphuncles. The family Dimeroceratidae ...

; a member of the

Goniatitida Goniatids, informally goniatites, are ammonoid cephalopods that form the order Goniatitida, derived from the more primitive Agoniatitida during the Middle Devonian some 390 million years ago (around Eifelian stage). Goniatites (goniatitids) su ...

, an

extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...

order of

ammonoid Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...

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 {{Goniatitida-stub