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''Scapteromys'' is a genus of South American rodents in the tribe Akodontini of family Cricetidae. Three species are known, found in northern Argentina, southern Brazil, Paraguay and Uruguay. They are as follows: * Argentine swamp rat (''Scapteromys aquaticus'') * Plateau swamp rat (''Scapteromys meridionalis'') * Waterhouse's swamp rat (''Scapteromys tumidus'') Species are semiaquatic, living in and near marshes and other bodies of water. They reach a body length of 15 to 20 cm and a tail length of 13-17 cm, and weigh 110-200 g. Fur color is dark gray on top and light gray on the underside. They are primarily crepuscular and nocturnal. Their diet consists mainly of insects; they also consume other invertebrates and plant material. The three species differ in karyotype, with ''aquaticus'' having 2n = 32, ''tumidus'' 2n = 24〔 and ''meridionalis'' 2n = 34/36.〔 == 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「Scapteromys」の詳細全文を読む スポンサード リンク
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