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Yabeinosaurus
''Yabeinosaurus'' is an extinct genus of lizard from the Early Cretaceous Jehol Group of northeastern China. The type species ''Yabeinosaurus tenuis'' is known from many well-preserved skeletons belonging to both juvenile and adult individuals. For about 60 years ''Yabeinosaurus'' was known only from juvenile specimens, leading scientists to believe that it was a small lizard with weakly developed bones. Because of this, it was thought to be closely related to geckos. Larger specimens up to long were first described in 2005, showing that ''Yabeinosaurus'' was a relatively large lizard when fully grown. Recent phylogenetic analyses indicate that ''Yabeinosaurus'' is not closely related to geckos but rather a very basal ("primitive") lizard close to the split between Iguania and Scleroglossa, one of the earliest divergences in the evolutionary history of lizards. Whether or not it lies outside this split or within Scleroglossa is uncertain.
In 2011 a fossil of ''Yabeinosaurus'' was discovered with 15 well-developed embryos inside it, making it the oldest fossil of a pregnant, viviparous (live-bearing) lizard yet discovered.〔(Fossil 'is first pregnant lizard' ), BBC Nature, 21 July 2011〕
==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「Yabeinosaurus」の詳細全文を読む
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