Trimeresurus purpureomaculatus is a venomous pit viper species native to India, Bangladesh and Southeast Asia. Common names include: mangrove pit viper, mangrove viper, and shore pit viper.
Males grow to a total length of , females . The maximum tail lengths are then and respectively.
Scales in 25-27 longitudinal rows at midbody; 11-13 upper labials, the first partially or completely united with the nasal; supraocular very narrow, sometimes broken into small scales, 12-15 scales between them; head scales small, subequal, tuberculate or granular; temporal scales keeled.
Body color highly variable: above olive, grayish, to dark purplish brown; below whitish, greenish or brown, uniform or spotted with brown; a light line on scale row one bordering ventrals present or absent; head olive, heavily suffused with brown.
Ventrals: males 160-179, females 168-183; subcaudals: males 74-76, females 56-63, paired; hemipenes without spines.
Mangrove pit viper, mangrove viper, shore pit viper, purple-spotted pit viper, shore pitviper.
Found in Bangladesh, India, Burma, Thailand, West Malaysia, Singapore and Indonesia (Sumatra and Java). The type locality is listed as "Singapore".