Mangrove pit vipers (Trimeresurus purpureomaculatus) occur in mangrove forests throughout Singapore (= type locality), eastern Sumatra, along the western coast of the Malay Peninsula, Thailand, and northwards to Myanmar and Bangladesh (Uetz et al., 2019). In central Myanmar, T. purpureomaculatus overlaps with another species of pit viper, T. erythrurus (Leviton et al., 2003). The latter species ranges from central and northern Myanmar, northwards to Bangladesh, Bhutan, northeast India, and Nepal (type locality = Ganges Delta; Uetz et al., 2019) with a disjunct population recently discovered in Kakinada on the Circar Coast of India (Deuti et al., 2021). While T. purpureomaculatus occurs exclusively in mangrove habitats, T. erythrurus can be found in both mangroves as well as moist, mesic/riparian habitats away from mangroves including rainforests and moist deciduous forests (
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