Dimeroceratidae

Dimeroceratidae; Temporal range: Devonian
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Goniatitida
Superfamily:	†Dimeroceratoidea
Family:	†Dimeroceratidae; Hyatt 1884
Subfamilies
	Dimeroceratinae; Paratornoceratinae; Sinotitinae;

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 was established for the genus which was previously included in the Cheiloceratidae in the Treatise on Invertebrate Paleontology Part L, but differing from the similar subglublar to thickly lentiuclar Cheiloceras in having a large lateral lobe and the umbilical lobe outside the umbilicus.

The Dimeroceratidae are derived from the Cheiloceratid genus through the ancestral which gave rise to Dimeroceras, (Saunders et al. 1999). Other genera included are Paratornoceras and Acrimeroceras.

Dimeroceratids have been found in the Devonian of China and Australia.

References[]

Miller, Furnish, & Schindewolf, 1957. Paleozoic Ammonoidea. Treatise on Invertebrate Paleontology Part L. R.C. Moore (Ed) Geological Society of America.
Saunders, Work, & Nikoleava, 1999. Evolution of Complexity in Paleozoic Ammonoid Sutures, Supplementary Material [1]
Dimeroceratidae-Paleodb

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