Thai National Parks

Species of Thailand

Triangle keelback

Xenochrophis trianguligerus

(Heinrich Boie, 1827)

In Thai: งูลายสอลายสามเหลี่ยม, ngu lai sor lai sam liam

The triangle keelback (Xenochrophis trianguligerus) is a species of snake found in Brunei Darussalam, Burma (Myanmar), Cambodia, India (Nicobar Islands; Arunachal Pradesh (Deban - Changlang district)), Indonesia (Nias, Mentawai, Sumatra, Laos, Malaysia (Malaya and East Malaysia), Singapore, Thailand, and Vietnam.

The type locality is Java.

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Scientific classification

Xenochrophis trianguligerus

Common names

  • German: Dreiecks-Fischnatter
  • English: Triangle keelback
  • Thai:
    • งูลายสอลายสามเหลี่ยม, ngu lai sor lai sam liam
    • งูลายสอน้ำตก, ngu lai sor namtok


  • Xenochrophis trianguligerus, Van Stanley Bartholomew Wallach et al. (2014)
  • Xenochrophis trianguligerus, Rudolf Malkmus et al. (2002)
  • Sinonatrix trianguligera, Ding-Qi Rao & Da-Tong Yang (1998)
  • Xenochrophis trianguligera, Merel J. Cox et al. (1998)
  • Xenochrophis trianguligerus, Ulrich Manthey & Wolfgang Grossmann (1997)
  • Natrix trianguligera, Richard Shine (1994)
  • Xenochrophis trianguligerus, E. V. Malnate & Garth Underwood (1988)
  • Sinonatrix trianguligerus, Ulrich Manthey (1983)
  • Natrix trianguligera, Alice Georgie Cruickshank Grandison (1978)
  • Sinonatrix trianguligera, Douglas Athon Rossman & W. G. Eberle (1977)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)


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Xenochrophis trianguligerus
Xenochrophis trianguligerus
Xenochrophis trianguligerus

Range Map

Distribution map of Triangle keelback, Xenochrophis trianguligerus in Thailand
  • Ao Luek District, Krabi
  • Bang Lang National Park
  • Betong District, Yala
  • Hala-Bala Wildlife Sanctuary
  • Hat Yai District, Songkhla
  • Hua Hin District, Prachuap Khiri Khan
  • Huai Kha Khaeng Wildlife Sanctuary
  • Huai Yot District, Trang
  • Kaeng Krachan National Park
  • Kathu District, Phuket
  • Khao Lak - Lam Ru National Park
  • Khao Luang National Park
  • Khao Nam Khang National Park
  • Khao Wang Hip
  • Khok Pho District, Pattani
  • Ko Samui District, Surat Thani
  • Kong Ra District, Phatthalung
  • Kra Buri District, Ranong
  • Kui Buri National Park
  • Mueang Krabi District, Krabi
  • Mueang Ranong District, Ranong
  • Na Mom District, Songkhla
  • Ngao Waterfall National Park
  • Nopphitam District, Nakhon Si Thammarat
  • Phipun District, Nakhon Si Thammarat
  • Raman Waterfall Forest Park
  • Sa Nang Manora Forest Park
  • Saba Yoi District, Songkhla
  • Sangkhla Buri District, Kanchanaburi
  • Si Banphot District, Phatthalung
  • Sirinat National Park
  • Sukhirin District, Narathiwat
  • Takua Pa District, Phang Nga
  • Thale Ban National Park
  • Thong Pha Phum District, Kanchanaburi
  • Thong Pha Phum National Park
  • Thung Khai Botanic Garden
  • Waeng District, Narathiwat
Range map of Xenochrophis trianguligerus in Thailand