
Photo: Alexander A. Fomichev · CC BY 4.0
Gloydius ussuriensis
Range
Far-eastern Russia, north-eastern China and the Korean Peninsula
Size
Males 37–63 cm; females 41–64.7 cm
Gloydius ussuriensis, the Ussuri pit viper or Ussuri mamushi, is a venomous pit viper endemic to far-eastern Russia, north-eastern China and the Korean Peninsula. No subspecies are recognised. (The Reptile Database; Wikipedia, general species account)
Adult males measure about 37–63 cm in total length and females about 41–64.7 cm, although the smallest males may have been subadults. It has 21 keeled dorsal scale rows at midbody, 146–157 ventral scales and 7 supralabials. (Wikipedia, general species account)