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The dangerously venomous White-lipped Pitviper, Trimeresurus albolabris (sometimes placed in genus Cryptelytrops, as C. albolabris; e.g., Malhotra and Thorpe 2004; Hoser 2012) is the most widely distributed Trimeresurus species (Song et al. 2015), occurring in Myanmar (north of 15°), India (Assam), southern Nepal, Bangladesh, Thailand, Cambodia, Laos, Vietnam, China, Malaysia, and western Indonesia as far east as Sulawesi (Leviton et al. 2003 and references therein; Song et al. 2015 and references therein).
According to Leviton et al. (2003), these snakes are often found in heavily degraded habitat or in agricultural areas. They occur in moist mixed deciduous and subtropical forests (both Northern Triangle and Northern Indochina) as well as in temperate forests. They are commonly encountered in bamboo stands, although individuals have also been found on trees, in bushes, on the ground in open fields, and cossing roads. Recorded elevations range from 60-751 m in Myanmar, although it has been recorded as high as 3050 in Nepal. These snakes are active at night. Reportedly prefers lowland habitats, both forested and open, and when in bushes or trees, usually within 2-3 m of the ground.
Snakebite is a common medical emergency in Thailand, although the fatality rate due to snakebite has declined from more than 200 cases per year in the 1940s to fewer than 20 cases per year in the 1980s. The green pit vipers (Trimeresurus spp.) are responsible for the great majority of venomous snakebites in Thailand. Suankratay et al. (2002) reported on a case of tetanus following a bite by T. albolabris, apparently the first report of tetanus following a green pitviper bite.
Song et al. (2015) sequenced and characterized the full mitochondrial genome of T. albolabris.
Peng and Fuji (2000) compared the hemipenes of several species of Trimeresurus, including T. albolabris.
Guo and Zhao (2006) compared the skull morphologies of nine Asian pitvipers, including T. albolabris.
Herrel et al. (2011) studied strike behavior and allometric variation among T. albolabris of different sizes.
Leviton et al. provide a technical description of this species: Scales in 21 (rarely 19) longitudinal rows at midbody; 10-11 (12) upper labials, the first partially or completely fused to the nasal; head scales small, subequal, feebly imbricate, smooth or weakly keeled; supraoculars narrow, occasionally enlarged, undivided, 8-12 interocular scales between them; temporal scales smooth; green above, side of head below eyes yellow, white or pale green, yellowish or whitish below, a light ventrolateral stripe present in all males, absent in females; end of tail not mottled brown. Ventrals: males 155-166, females 152-176; subcaudals: males: 60-72, females 49-66, paired. Hemipenes without spines. Total length: males 600 mm, females 810 mm; tail length: males 120 mm, females 130 mm.