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''Indobrachyops'' is an extinct genus of temnospondyl amphibian from the Early Triassic of India. It is known from a nearly complete fossil skull that was first described by paleontologists Friedrich von Huene and M. R. Sahni in 1958 from the Panchet Formation in Raniganj Coalfield. ''Indobrachyops'' belongs to a group of mostly semi-aquatic temnospondyls called Stereospondyli, but its exact placement within the group has been uncertain since its first description. ==Classification== Huene and Sahni considered ''Indobrachyops'' to be part of the family Brachyopidae, which includes several aquatic temnospondyls with large rounded heads. However, later studies noted several features of ''Indobrachyops'' that set it apart from brachyopids, including closely spaced nostrils and a different pattern of pits and grooves on the skull roof. In 1979, J. W. Cosgriff and J. M. Zawiskie placed ''Indobrachyops'' in a new family called Indobrachyopidae along with the poorly known temnospondyls ''Mahavisaurus'' and ''Rewana''. The lacrimal bone in the skull is an important feature in classifying stereospondyls, but its presence has been difficult to judge in the single known skull of ''Indobrachyops''. One study suggested that it lacked a lacrimal, which it used as evidence to reclassify ''Indobrachyops'' within the family Rhytidosteidae. In 1998 paleontologists Anne Warren and Claudia Marsicano proposed that it did have a lacrimal, albeit a very small one that suggested a primitive position for ''Indobrachyops'' within Rhytidosteidae. A phylogenetic analysis of rhytidosteids by Marsicano and Sérgio Dias-da-Silva in 2011 supported the inclusion of ''Indobrachyops'' within Rhytidosteidae.〔 The analysis went against Warren and Marsicano's 1998 findings by placing ''Indobrachyops'' as one of the most derived rhytidosteids. Marsicano and Sérgio Dias-da-Silva classified the genus within a new subfamily of rhytidosteids, Derwentiinae. Below is a cladogram from their study:〔 |2= |label2=Derwentiinae |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「Indobrachyops」の詳細全文を読む スポンサード リンク
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