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In mammals, ungual tufts are tufts of hairs at the base of claws of the fore- and hindfeet. Their presence has been used as a character in cladistic studies of Cricetidae.〔Weksler, 2006, p. 19〕 Oryzomyini ("rice rats") normally have ungual tufts, but they may be reduced or absent in semiaquatic species (adapted to life in the water).〔Weksler, 2006, p. 81〕 ''Lundomys molitor'', ''Nectomys apicalis'', the marsh rice rat (''Oryzomys palustris''), and species of ''Holochilus'' lack ungual tufts on their forefeet.〔Weksler, 2006, p. 23〕 On the hindfeet, most species have well-developed ungual tufts only on the second to fifth toes, but ''Sooretamys angouya'' and ''Eremoryzomys polius'' also have thick tufts on the first toe. ''Pseudoryzomys simplex'', ''Mindomys hammondi'', ''Nectomys squamipes'', ''Sigmodontomys alfari'', ''Oryzomys couesi'', the marsh rice rat, and species of ''Melanomys'' have sparse ungual tufts only, and ''Lundomys molitor'', ''Nectomys apicalis'', ''Sigmodontomys aphrastus'', and species of ''Holochilus'' have very reduced tufts or lack them entirely.〔Weksler, 2006, p. 24〕 Among other South American cricetids, ''Abrothrix lanosus'' has white ungual tufts that are shorter than the claws.〔Feijoo et al., 2010, p. 128〕 ''Akodon paranaensis'' has long ungual tufts.〔Christoff et al., 2000, p. 845〕 ''Calomys cerqueirai'' has silvery tufts on the second through fifth digits of the forefeet and all digits of the hindfeet.〔Bonvicino et al., 2010, p. 29〕 ''Abrawayaomys'' has long, dense ungual tufts.〔Pardiñas et al., 2009, p. 41〕 The Tylomyinae are characterized by the presence of ungual tufts on their hindfeet.〔Musser and Carleton, 2005, p. 1186〕 White ungual tufts are also present in the Philippine murine genus ''Batomys''. ''B. hamiguitan'' and ''B. russatus'' have short tips, not extending to the tips of the claws, but those of ''B. granti'' and ''B. salomonseni'' have tufts longer than the claws.〔Balete et al., 2008, p. 420〕 The Malagasy ''Monticolomys'' has long ungual tufts, extending beyond the claws, whereas the related ''Macrotarsomys'' has shorter tufts.〔Carleton and Goodman, 1996, p. 233〕 The Brazilian spiny rat ''Phyllomys sulinus'' has long, light gray ungual tufts.〔Leite et al., 2008, p. 847〕 The tenrec ''Microgale jobihely'' has long, dark brown ungual tufts.〔Goodman et al., 2006, p. 389〕 The opossum ''Monodelphis handleyi'' has short ungual tufts.〔Solari, 2007, p. 325〕 ==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「ungual tuft」の詳細全文を読む スポンサード リンク
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