Gloydius shedaoensis is a venomous pitviper species found only on Shedao Island [zh] in China.

Also, the second supralabial scale is low and does not form the anterior margin of the heat-sensing loreal pit.

The type locality given is "Shedao (Snake Island), situated about 24 nautical miles (44 km) [27.6 statute miles] from and to the north-west of Lüshun (Port Arthur), Liaoning Province, altitude below 215 m [705 feet]" (China).

[4] However, despite its small size, the population density of these snakes on the island has long been known to be extremely high.

[4] Prey is ambushed either on the ground or from tree branches, the snake waiting with the anterior portion of its body in a concertina shape.