Dvinosauria

Dvinosauria
Dvinosauria
Temporal range: Late Carboniferous - Early Triassic
Dvinosaurus primus
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Temnospondyli
Suborder: Dvinosauria
Yates and Warren, 2000
Families
  • 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



    Neldasaurus





    Perryella


     Dvinosauroidea 

    Isodectes (Eobrachyopidae)




    Acroplous (Eobrachyopidae)




    Dvinosaurus


     Tupilakosauridae 

    Slaugenhopia



    Tupilakosaurus



    Thabanchuia









    References

    1. ^ 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. 

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