Dvinosauria

Dvinosauria Temporal range: Late Carboniferous - Early Triassic
Dvinosaurus primus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Order:	†Temnospondyli
Suborder:	†Dvinosauria Yates and Warren, 2000

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