Dimorphoceratinae

Dimorphoceratinae; Temporal range: Late Paleozoic
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Goniatitida
Suborder:	Goniatitina
Superfamily:	Dimorphocerataceae
Family:	Dimorphoceratidae; Hyatt 1884
Subfamily:	Dimorphoceratinae
Genera
	Asturoceras; Dimorphoceras; Trizonoceras;

Dimorphoceratinae is one of two subfamilies included in the family Dimorphoceratidae. 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

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