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Reptiles of Thailand

Species of Thailand

Hagen’s pit viper

Thai: งูแก้วหางแดง, ngu geow hang daeng

Binomial name: Trimeresurus hageni, Theodorus Willem van Lidth de Jeude, 1886

Trimeresurus hageni is a venomous pit viper species endemic to Southeast Asia. No subspecies are currently recognized.


The specific name, hageni, is in honor of naturalist "Dr. B. Hagen", who collected mammals, birds, reptiles, and insects in the eastern part of Sumatra.


Scalation includes 21 rows of dorsal scales at midbody, 76–98 ventral scales, 63–89 subcaudal scales, and 9–12 supralabial scales.

Geographic range

This species is found in Peninsular Thailand, Peninsular Malaysia, Singapore 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".

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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)
  • Lachesis hageni, Theodorus Willem van Lidth de Jeude (1922)
  • Lachesis sumatranus, George Albert Boulenger (1896)
  • Bothrops hageni, Bernhard Hagen (1890)
  • Bothrops hageni, Theodorus Willem van Lidth de Jeude (1886)
  • Trimeresurus sumatranus, Thomas Stamford Raffles (1822)
  • Lachesis sumatranus nec Coluber sumatranus, Thomas Stamford Raffles (1822)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)

No photo for this species yet

Distribution map of Hagen’s pit viper, Trimeresurus hageni in Thailand
  • Hala-Bala Wildlife Sanctuary
  • Khao Chong
  • Na Yong District, Trang
  • Ron Phibun District, Nakhon Si Thammarat
  • Sadao District, Songkhla
  • San Kala Khiri National Park
  • Thale Ban National Park
  • Ton Nga-Chang Wildlife Sanctuary
  • Trang Province
  • Waeng District, Narathiwat

Range map of Trimeresurus hageni in Thailand

Important note; our range maps are based on limited data we have collected. The data is not necessarily accurate or complete.

Special thanks to Ton Smits, Parinya Pawangkhanant, Ian Dugdale and many others for their contribution for range data.

It is free to use this map on various media. See the creative common license terms by clicking "CC" icon below the map. But remember, again; the map may not be accurate or complete.

Contribute or get help with ID

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