Typhlomys chapensis
Rare visitor: recorded only occasionally in this country
Range
Northern Vietnam, west of the Red River, and southern Yunnan
Size
Body 7–10cm; tail 10–13cm
The Chapa pygmy dormouse, or Vietnamese pygmy dormouse, is a nocturnal rodent endemic to Vietnam, 7–10 cm long with a 10–13 cm tail and long ears. In 2014 it was mainly found west of the Red River in northern Vietnam and southern Yunnan, China (Wikipedia, general species account).
It was previously seen as a subspecies of the Chinese pygmy dormouse, along with several other forms, and in 2014 it was confirmed by Abramov and colleagues as a separate species.