Dimorphoceratinae is one of two

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 subfamily botanical names with "-oideae", and zoologi ...

included in the family

Dimorphoceratidae Dimorphoceratidae is one of two families included in the Dimorphoceratoidea, a superfamily of ammonoid cephalopods belonging to the Goniatitida Goniatids, informally goniatites, are Ammonoidea, ammonoid cephalopods that form the order Goniatit ...

. The subfamily is characterized by having only the ventral lobe of the suture subdivided. Shells are completely involute, with the inner whorls completely hidden, and mostly suboxiconic such that the rim, or venter, is fairly narrow. Sculpture consists only of growth lines, sometimes with delicate spiral ornamentation. The Ventral lobe becomes extremely wide by subdivision.

References

GONIAT Online - Dimorphoceratinae
5/30/12
The Paleobiology Database
10/01/07 Dimorphoceratidae {{Goniatitida-stub