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''Herpetotherium'' is an extinct genus of metatherian mammal. Fossils have been found in California, Oregon, Texas, Florida, Montana, Wyoming, Colorado, North and South Dakota, Nebraska, and Saskatchewan.〔(【引用サイトリンク】url=http://fossilworks.org/bridge.pl?action=taxonInfo&taxon_no=39965&is_real_user=1 )〕 The oldest species, ''H. knighti'', is dated to around 50.3 mya,〔(【引用サイトリンク】url=http://fossilworks.org/bridge.pl?a=taxonInfo&taxon_no=46893 )〕 and the most recent, an unnamed species, may be as recent as 15.97 mya.〔 A morphological analysis of marsupials and basal metatherians conducted in 2007 found ''Herpetotherium'' to be the sister group to extant marsupials. ==Species== *''H. fugax'' (syn. ''Didelphys pygmaea'', ''H. scalare'', ''H. tricuspis'', ''Peratherium fugax'') (type) *''H. huntii'' *''H. knighti'' (syn. ''Centracodon delicatus'', ''Entomacodon minutus'', ''Peratherium morrisi'') *''H. merriami'' *''H. valens'' (syn. ''Peratherium donahoei'') *''H. youngi'' (syn. ''Peratherium spindleri'') 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「Herpetotherium」の詳細全文を読む スポンサード リンク
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