Trimeresurus hageni
Trimeresurus hageni, commonly known as Hagen's pit viper and Hagen's green pit viper, is a species of venomous snake in the subfamily Crotalinae of the family Viperidae. The species is native to Southeast Asia. There are no subspecies that are recognized as being valid.
Etymology
The specific name, hageni, is in honor of German naturalist Dr. Bernhard Hagen, who collected mammals, birds, reptiles, and insects in the eastern part of Sumatra.Description
Scalation of T. hageni includes 21 rows of dorsal scales at midbody, 176–198 ventral scales, 63–89 subcaudal scales, and 9–12 supralabial scales. The lectotype has a total length of.Geographic range
T. hageni is found in Peninsular Thailand, Peninsular Malaysia, East Malaysia, and Indonesia.The type locality given is "Sumatra... island of Banka". Brongersma emended this to "Deli, Sumatra".