Trimeresurus trigonocephalus is a venomous pitviper species found in Sri Lanka. No subspecies are currently recognized.
A sexually dimorphic species, at a maximum of 70 cm in length the males are considerably smaller than females, which can grow to 130 cm. In addition, male tends to have a blue coloration, whereas the females are predominantly green. These are bulky snakes with a prehensile tail, suiting their arboreal lifestyle.
Common names : Sri Lankan green pitviper, Sri Lankan pit viper, pala polonga, green pit viper.
