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Horsfield's tarsier (''Cephalopachus bancanus''), also known as the western tarsier, is the only species of tarsier in the genus ''Cephalopachus''. It occurs on Borneo, Sumatra and nearby islands and is, like other members of the group, entirely nocturnal. ==Taxonomy== Although Horsfield's tarsier was usually placed in the genus ''Tarsius'' with all other living tarsiers, it is quite distinct from the Philippine tarsier and the various tarsiers of Sulawesi and nearby islands; therefore, scientists have placed it in a separate genus, ''Cephalopachus''. The taxonomy of this species is in doubt, with some subspecies considered unsure. In fact, over 20 years few studies have been done on ''C. bancanus'' and a taxonomic revision based upon intensive and systematic field surveys is overdue. The IUCN believes that these subspecies should be treated as distinct and named as separate taxa until more definitive evidence is available. When splitting the species into its own genus, Colin Groves and Myron Shekelle recognized the ''natunensis'' population as a distinct subspecies.〔 There are four recognized subspecies of Horfield's tarsier: * ''Cephalopachus bancanus bancanus'' * ''Cephalopachus bancanus saltator'' — Belitung Island tarsier * ''Cephalopachus bancanus borneanus'' — Bornean tarsier * ''Cephalopachus bancanus natunensis'' — Natuna Islands tarsier 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「Horsfield's tarsier」の詳細全文を読む スポンサード リンク
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