Trimeresurus sabahi, commonly known as the Sabah pit viper or Sabah bamboo pitviper, is a venomous pitviper species. If defined narrowly, it is endemic to the island of Borneo. If defined more broadly, it consists of five subspecies found in Southeast Asia.
There are five subspecies:
IUCN treats these as full species, respectively T. barati, T. buniana, T. fucatus, and T. toba, restricting T. sabahi to the nominotypical subspecies.
Adults may attain a snout-vent length (SVL) of .
Dorsally, it is uniform green, without crossbars. Ventrally it is pale green. There is narrow bicolor stripe on the first one and a half dorsal scale rows. In males this stripe is rust-colored or red below, and it is white above. In females it is yellow or white. The iris of the eye is red or orange in adults of both sexes, but in young specimens may be yellowish-green. There are no markings behind the eye.
The scalation includes 21 (23) rows of dorsal scales at midbody, 149âÂÂ157/148âÂÂ156 ventral scales in males/females or 148âÂÂ159 in general, 72âÂÂ76/59âÂÂ65 subcaudal scales in males/females, and 9âÂÂ11 supralabial scales (9âÂÂ10 with the third being the largest).
In Borneo, it inhabits mountainous regions at altitudes from to , where it is commonly found on branches of shrubs and other low vegetation.
The reproductive biology of this species is unknown.