中国啮齿类一属、种新纪录——道氏东京鼠

New record of a rodent genus ( Murinae) in China——Tonkinomys daovantieni

Musser等（2006）根据在越南东北部谅山省HuuLien自然保护区（北纬21°40′52″，东经106°20′28″）采集的14号标本描述了新属新种：道氏东京鼠（Tonkinomys daovantieni），隶属于啮齿目（Rodentia）鼠科（Muridae）鼠亚科（Murinae），正模标本（AMNH：275618）现保存于美国自然历史博物馆，目前该属为单型属。由于发现时间较短，迄今为止，该物种的分布区仅限于模式产地。

From November 2016 to April 2017, we collected four rodent specimens from Jinchang, Babu and Majie in Malipo County, Yunnan Province, China. They are different from any mammalian species described so far in China and have been identified as Tonkinomys daovantieni Musser et al. , 2006, a new record of the genus in China. Its main features are： dorsal pelage grayish black with semi-spinous, dense fur, ventral pelage grayish; a thick, bieolored tail considerably shorter than length of head and body, the distal 1/3 white, the proximal 2/3 of its dorsal and lateral dark brown and ventral white ; the first and the second molars consist of tightly pressed rows exposing chunky chewing surfaces in the shapes of two parallel chevrons and a roughly diamond-shaped chewing surface, the third molar consists of a front chevron formed by union of protoconid and metaconid and behind that a large oblong structure likely representing the complete fusion of hypoconid and entoconid. Each lower molar has two roots. The Cyt b sequence is 97.7% identical to the specimens from the type locality and phylogenetic analysis by maximum likelihood algorithm supported the two populations to be monophyletic （ BS = 100% ）. This finding is the first recorded distribution of genus Tonkinomys in China and outside of the type locality.