Pareiasauria

Pareiasauria

 

a suborder of extinct Late Permian reptiles of the subclass Cotylosauria. The reptiles had a short, broad skull with cavities resembling large honeycomb cells. There were lateral processes on the cheekbones. The teeth had crenate crowns adapted for grinding vegetable substances. The limbs were massive. Some species had a dorsal shell of bony plates. The reptiles ranged in length from approximately 1 m to 3 m. A typical representative was Skutosaurus, of which several skeletons were found in the early 20th century in the Severnaia Dvina. Pareiasauria inhabited southern Africa and regions west of the Urals.

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The position of Nyctiphruretus remained unresolved within Parareptilia in the strict consensus tree of Muller and Tsuji (2007) but Tsuji (2006) recovered Nyctiphruretus as the sister group of a clade consisting of Macroleter and Pareiasauria in the single MPT (most parsimonious tree) of her analysis.
Thus, neither the position of Nyctiphruretus as the sister group of the Procolophonoidea found in this analysis or as the sister group to Pareiasauria + Macroleter found in Tsuji (2006) has statistically significantly better support than the other.