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''Tokudaia'' is a genus of murine rodent native to Japan. Known as Ryūkyū spiny rats or spinous country-rats, population groups exist on several non-contiguous islands.〔(''Mammalian Genome'' article )〕 Despite differences in name and appearance, they are the closest living relatives of the Eurasian field mouse (''Apodemus''). Of the three species, both ''T. osimensis'' and ''T. tokunoshimensis'' have lost their Y chromosome and ''SRY'' gene; the sex chromosomes of ''T. muenninki'', on the other hand, are abnormally large. Named species are:〔 * Muennink's spiny rat, ''Tokudaia muenninki'' * Ryukyu spiny rat, ''Tokudaia osimensis'' * Tokunoshima spiny rat, ''Tokudaia tokunoshimensis'' At least ''Tokudaia osimensis'' may be a cryptic species complex. ==See also== * ''Ellobius'' 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「Tokudaia」の詳細全文を読む スポンサード リンク
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