Dvinosauria

Dvinosauria Temporal range: Late Carboniferous - Early Triassic
Dvinosaurus primus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Superclass:	Tetrapoda
Class:	Amphibia
Order:	Temnospondyli
Suborder:	Dvinosauria Yates and Warren, 2000
Families
Trimerorhachidae Eobrachyopidae Dvinosauridae Tupilakosauridae Kourerpetontidae

Dvinosaurs are one of several new clades of Temnospondyl amphibians named in the phylogenetic review of the group by Yates and Warren 2000. They represent a group of primitive semi-aquatic to completely aquatic amphibians, and are known from the Late Carboniferous to the Early Triassic, being most common in the Permian period. Their distinguishing characteristics are a reduction of the otic notch; the loss of a flange on the rear side of the pterygoid; and 28 or more presacral vertebrae.

References

• Laurin, M. and Steyer, J-S (2000) Phylogeny and Apomorphies of Temnospondyls, The Tree of Life Web Project
• Yates, A. M., and Warren A. A., 2000, The phylogeny of the ‘higher’ temnospondyls (Vertebrata: Choanata) and its implications for the monophly and origins of the Stereospondyli: Zoological Journal of the Linnean Society, v. 128, p. 77-121.

Links

• Temnospondyli: Limnarchia at Palaeos
• Dvinosauria at Mikko's Phylogeny Archive (cladogram based on Yates and Warren 2000)
• Suborder †Dvinosauria - Scientific Hierarchy at the Taxonomicon