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''Gamerabaena'' is an extinct genus of baenid turtle which existed in North Dakota during the late Cretaceous period. It is known from a single fragmentary skull that was found in the Maastrichtian-age Hell Creek Formation. It contains the species ''Gamerabaena sonsalla''. ''Gamerabaena'' is similar to the genus ''Palatobaena'', but it differs in its lack of a posterior expansion of the triturating (or chewing) surface, a somewhat rectangular skull, and a wide angle between the maxillae. ''Gamerabaena'' also has a lingual ridge on the inner side of the jaw that is not seen in ''Palatobaena''.〔 ''Gamerabaena'' is considered the sister taxon of ''Palatobaena'' and shares features with both ''Palatobaena'' and ''Plesiobaena''. These features, which include slightly upturned eye sockets, are seen as intermediate between the two other genera. While ''Gamerabaena'' is known only from the skull, it may belong to the same species as ''"Baena" hayi'', which is known primarily from the shell.〔 == Phylogeny == Cladogram after Tyler R. Lyson and Walter G. Joyce (2009). }} }} }} }} |label2= Eubaenini |2= }} }} }} }} }} }} }} 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「Gamerabaena」の詳細全文を読む スポンサード リンク
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