Thai National Parks

Species of Thailand

Hagen's pit viper

Trimeresurus hageni, Theodorus Willem van Lidth de Jeude, 1886

(In Thai: งูแก้วหางแดง, ngu geow hang daeng)

Trimeresurus hageni, commonly known as the Hagen's pit viper (or Hagen's green pit viper), is a species of pit viper, a venomous snake in the subfamily Crotalinae of the family Viperidae. The species is endemic to Southeast Asia. There are no subspecies which are currently 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.

Geographic range

Trimeresurus hageni is found in Peninsular Thailand, Peninsular Malaysia, East Malaysia (Borneo)), Singapore and Indonesia (Sumatra and the nearby islands of Bangka, Simalur, Nias, Batu, and the Mentawai Islands).

The type locality given is "Sumatra ... island of Banka". Brongersma (1933) emended this to "Deli, Sumatra".


Trimeresurus hageni is oviparous.

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Scientific classification

Trimeresurus hageni

Common names

  • German: Hagens Bambusotter
  • English:
    • Hagen's green pit viper
    • Hagen's pitviper
  • Thai: งูแก้วหางแดง, ngu geow hang daeng


  • Parias hageni, Tanya Chan-Ard et al. (2015)
  • Parias hageni, Van Stanley Bartholomew Wallach et al. (2014)
  • Trimeresurus (Parias) hageni, David et al. (2011)
  • Parias hageni, Anita Malhotra & Roger Stephen Thorpe (2004)
  • Trimeresurus hageni, Roy W. McDiarmid, Jonathan A. Campbell & T'Shaka A. Touré (1999)
  • Trimeresurus hageni, Merel J. Cox et al. (1998)
  • Trimeresurus hageni, Ulrich Manthey & Wolfgang Grossmann (1997)
  • Trimeresurus hageni, Kenneth R. G. Welch (1994)
  • Trimeresurus hageni, Alice Georgie Cruickshank Grandison (1972)
  • Trimeresurus hageni, Léo Daniël Brongersma (1933)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)


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Trimeresurus hageni (male) - Bang Lang National Park
Trimeresurus hageni - Bang Lang National Park
Trimeresurus hageni (juvenile) - Bang Lang National Park
Trimeresurus hageni - Hala Bala Wildlife Sanctuary

Copyright Khao Sok Snakes

Trimeresurus hageni - Hala Bala Wildlife Sanctuary
Trimeresurus hageni - Hala-Bala Wildlife Sanctuary

Range Map

Distribution map of Hagen's pit viper, Trimeresurus hageni in Thailand
  • Bang Lang National Park
  • Betong District, Yala
  • Hala-Bala Wildlife Sanctuary
  • Khao Chong
  • Khao Pu - Khao Ya National Park
  • Lan Saka District, Nakhon Si Thammarat
  • Na Thawi District, Songkhla
  • Na Yong District, Trang
  • Ron Phibun District, Nakhon Si Thammarat
  • Sadao District, Songkhla
  • San Kala Khiri National Park
  • Thale Ban National Park
  • Than To Waterfall Forest Park
  • Ton Nga-Chang Wildlife Sanctuary
  • Waeng District, Narathiwat
  • Wang Wiset District, Trang
Range map of Trimeresurus hageni in Thailand