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''Thylamys'' is a genus of opossum in the family Didelphidae. The premaxillae are rounded rather than pointed. The females lack a pouch. The females' nipples are arranged in two symmetrical rows on the abdomen All species but ''T. macrurus'' store fat in their tails., although this is not necessarily true for all species in the genus. The genus contains the following species: *Cinderella fat-tailed mouse opossum (''Thylamys cinderella'') *(''Thylamys citellus'') 〔http://www.iucnredlist.org/apps/redlist/details/199835/0〕 *Elegant fat-tailed mouse opossum (''Thylamys elegans'') *(''Thylamys fenestrae'') 〔http://www.iucnredlist.org/apps/redlist/details/199836/0〕 *Karimi's fat-tailed mouse opossum (''Thylamys karimii'') *Paraguayan fat-tailed mouse opossum (''Thylamys macrurus'') *White-bellied fat-tailed mouse opossum (''Thylamys pallidior'') *(''Thylamys pulchellus'') 〔http://www.iucnredlist.org/apps/redlist/details/199834/0〕 *Common fat-tailed mouse opossum (''Thylamys pusillus'') *Argentine fat-tailed mouse opossum (''Thylamys sponsorius'') *Tate's fat-tailed mouse opossum (''Thylamys tatei'') *Dwarf fat-tailed mouse opossum (''Thylamys velutinus'') *Buff-bellied fat-tailed mouse opossum (''Thylamys venustus'') Fossils belonging to the genus date back to the Miocene, with the oldest specimens being found in Argentina and Colombia. Genetic studies indicate that the genus may have originated around 14 million years ago. ==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「Thylamys」の詳細全文を読む スポンサード リンク
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