Gloydius brevicauda

Gloydius brevicauda is a pit viper species endemic to China and the Korean Peninsula, known as the short-tailed pit viper or short-tailed mamushi. Adults are relatively stout, with a broad head and short tail. This is the spelling Wikipedia uses for the species also listed here as Gloydius brevicaudus. (Wikipedia, general species account)

The largest male examined in one study was 71 cm in total length and the largest female 69 cm. It has 21 dorsal scale rows at midbody, 135–149 ventral scales and 30–44 mostly paired subcaudals. (Wikipedia, general species account)