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'' Baiyankamys'' is a genus of amphibious Muridae rodent. It was originally described, along with the species ''Baiyankamys shawmayeri'' by Hinton in 1943 after he found the remains of a single individual in south east of the Bismarck Mountain Range, north east New Guinea. Tate, in 1951 and, Laurie and Hill in 1954, confirmed the existence of both the species and genus. ==Classification== Hinton described '' Baiyankamys'' as similar in appearance to the species ''Hydromys habbema'' but differed due to its unreduced pinnae and its lower teeth. It was described as having three lower molars on both sides of the lower jaw, whereas other genera of amphibious murines in New Guinea have only two.〔 In 1968 Mahoney discovered that the specimen of ''B. shawmayeri'' was a composite resulting from an incorrectly associated mandible of the species ''Rattus niobe'' and the skull of a small water rat. When the correct mandible was found in the BMNH collections Mahoney proposed that, based on their similarity ''B. shawmayeri'' should be classified as a synonym of ''H. habbema''. However, Musser and Carleton (1993, 2005) and Flannery (1995) later proposed that the species Hinton described should be classified as ''Hydromys shawmayeri'', closely related but distinct from ''H. habbema'', based on the fact that they are easily distinguished by external and cranial traits,. In 2005 Helgen proposed that generic name of ''Baiyankamys'' be used for ''shawmayeri'' and ''habbema'', removing them both from the ''Hydromys'' genus. This was due to morphological differences in phallic anatomy, and many external and craniodental traits.〔 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「Baiyankamys」の詳細全文を読む スポンサード リンク
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