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''Polrussia'' is an extinct genus of iguanian lizard dating to the Late Cretaceous epoch, found in what is now Mongolia. It belongs to a group of extinct iguanians called Gobiguania that was endemic to the Gobi Desert during the Late Cretaceous. The type species ''Polrussia mongoliensis'' was named in 1991 on the basis of a skull found in the Barun Goyot Formation. The genus name refers to the Polish and Russian paleontologists who worked together to find and describe the material. ''Polrussia'' has a short skull, slightly pointed and flattened snout, and large eye sockets. The teeth each have one cusp, as opposed to the multiple cusps seen in some other gobiguanians. The skull is only long, making ''Polrussia'' one of the smallest gobiguanians. Below is a cladogram from Daza ''et al.'' (2012) showing the phylogenetic relationships of ''Polrussia'': |2= |label2=Iguanoidea (=Pleurodonta) |2= |5= }} }} }} |label2=Euiguana |2= }} }} }} }} }} }} }} }} }} }} ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polrussia」の詳細全文を読む スポンサード リンク
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