Dimeroceratidae

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

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 Dimeroceras 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 umbilucus.

The Dimeroceratidae are derived from the Cheiloceratid genus Torleyoceras through the ancestral Paradimeroceras 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

This article is issued from Wikipedia - version of the 6/8/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.