Typhlomys chapensis
Range
Northern Vietnam and southern Yunnan, China
Size
7–10cm long, tail 10–13cm
The Chapa tree mouse, also called the Chapa pygmy dormouse or Vietnamese pygmy dormouse, is a nocturnal rodent 7–10cm long with a tail of 10–13cm and long ears. In 2014 it was found mainly west of the Red River in northern Vietnam and in southern Yunnan Province in China (Wikipedia, general species account).
It was previously treated as a subspecies of the Chinese pygmy dormouse, and a 2014 study confirmed it as a separate species (Wikipedia, general species account).