Hagen’s Pitviper
Trimeresurus hageni
- KingdomAnimalia (Animals)
- PhylumChordata (Chordates)
- ClassSquamata
- FamilyViperidae (Vipers)
- GenusTrimeresurus (Asian Lanceheads)
- SpeciesTrimeresurus hageni (Hagen’s Pitviper)
About the Hagen’s Pitviper
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.
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. 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 (including tail) of 97 cm (38 in).
T. hageni is found in Peninsular Thailand, Peninsular Malaysia, East Malaysia (Borneo), and Indonesia (Sumatra and the nearby islands of Bangka, Simalur, Nias, Batu, and the Mentawai Islands). The type locality given is "Sumatra... [and] island of Banka". Brongersma (1933) emended this to "Deli, Sumatra".
The preferred natural habitat of T. hageni is forest, at altitudes of 100–300 m (330–980 ft). T. hageni is arboreal and nocturnal. T. hageni preys... Wikipedia →
Closest Relatives at Gunung Leuser National Park
Global Distribution
Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.
where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is) · parks where it occurs — tap a pin for the sighting probability there
Parks Where Found
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Gunung Leuser National Park | 🇮🇩 Indonesia |
More parks will be added in future updates.
Quick answers
What are the chances of seeing a Hagen’s Pitviper in Gunung Leuser National Park?
About 20% of wildlife watchers report a Hagen’s Pitviper sighting in Gunung Leuser National Park, based on 14 verified sightings from GBIF citizen-science data.
When is the best time to see Hagen’s Pitviper in Gunung Leuser National Park?
September has the highest sighting rate for Hagen’s Pitviper in Gunung Leuser National Park in our monthly data.