- Dvinosauria
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Dvinosauria
Temporal range: Late Carboniferous - Early TriassicDvinosaurus primus Scientific classification Kingdom: Animalia Phylum: Chordata Class: Amphibia Order: †Temnospondyli Suborder: †Dvinosauria
Yates and Warren, 2000Families - 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.
Trimerorhachidae is the most basal family of dvinosaurs. Most other dvinosaurs are placed in the superfamily Dvinosauroidea. Within Dvinosauroidea are two families, Eobrachyopidae and Tupilakosauridae, as well as dvinosaurs that cannot be placed in either family, such as Dvinosaurus and Kourerpeton. A 2008 phylogenetic analysis found Eobrachyopidae to be paraphyletic, representing a grade of basal dvinosauroids. Below is a cladogram showing the phylogenetic relationships of dvinosaurs from Englehorn et al. (2008):[1]
Dvinosauria Trimerorhachidae Trimerorhachis
Perryella
Dvinosauroidea Isodectes (Eobrachyopidae)
Acroplous (Eobrachyopidae)
Tupilakosauridae Slaugenhopia
Tupilakosaurus
Thabanchuia
References
- ^ Englehorn, J.; Small, B.J.; and Huttenlocker, A. (2008). "A redescription of Acroplous vorax (Temnospondyli: Dvinosauria) based on new specimens from the Early Permian of Nebraska and Kansas, U.S.A.". Journal of Vertebrate Paleontology 28 (2): 291–305. doi:10.1671/0272-4634(2008)28[291:AROAVT]2.0.CO;2.
- 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
Dvinosauroidea EobrachyopidaeAcroplous · Erpetosaurus · IsodectesKourerpetidaeKourerpetonTupilakosauridaeSlaugenhopia · Thabanchuia · TupilakosaurusTrimerorhachidae Other genera PerryellaRelated categories Temnospondyls · Carboniferous amphibians · Permian amphibians ·
Triassic amphibiansCategories:- Temnospondyls
- Prehistoric amphibian stubs
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- 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.