Thai National Parks

Species of Thailand

Assam mountain snake

Plagiopholis nuchalis

George Albert Boulenger, 1893

In Thai: งูหัวลายลูกศร, ngu hua lai look sorn

Plagiopholis nuchalis, commonly known as the Assam mountain snake, is a species of snake in the family Colubridae. The species is endemic to Asia.

Geographic range

P. nuchalis is found in China (Yunnan), Laos, Myanmar, and Thailand. It may possibly also be found in India (Assam) and Vietnam.


A small snake, P. nuchalis may attain a total length of 45 cm, which includes a tail 5.5 cm long. Dorsally it is blackish brown, with many of the dorsal scales edged with black. On the neck there is a broad black chevron, pointing forward, to which the specific name, nuchalis, refers. Ventrally it is yellowish, marked with black.


P. nuchalis is oviparous.

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Scientific classification

Plagiopholis nuchalis

Common names

  • Chinese: 缅甸颈斑蛇
  • German: Indische Halsbandnatter
  • English:
    • Assam mountain snake
    • Assamese mountain snake
  • Thai: งูหัวลายลูกศร, ngu hua lai look sorn


  • Plagiopholis nuchalis, Van Stanley Bartholomew Wallach et al. (2014)
  • Plagiopholis nuchalis, Frank Tillack et al. (2006)
  • Plagiopholis nuchalis, Merel J. Cox et al. (1998)
  • Oligodon kunmingensis, Zi-Tong Kou & Jie-Yun Wu (1993)
  • Plagiopholis nuchalis, Malcolm Arthur Smith (1943)
  • Plagiopholis nuchalis, Malcolm Arthur Smith (1940)
  • Trirhinopholis nuchalis, Frank Wall (1921)
  • Oligodon evansi, Frank Wall (1913)
  • Trirhinopholis nuchalis, George Albert Boulenger (1893)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)


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Plagiopholis nuchalis
Plagiopholis nuchalis
Plagiopholis nuchalis

Range Map

Distribution map of Assam mountain snake, Plagiopholis nuchalis in Thailand
  • Chiang Dao Wildlife Sanctuary
  • Doi Chang
  • Doi Inthanon National Park
  • Doi Khun Tan National Park
  • Doi Pha Hom Pok National Park
  • Doi Phu Kha National Park
  • Doi Suthep - Pui National Park
  • Hot District, Chiang Mai
  • Kaeng Krachan National Park
  • Khao Yai National Park
  • Mae Chai District, Phayao
  • Mae Fa Luang District, Chiang Rai
  • Mae La Noi District, Mae Hong Son
  • Mae Lao-Mae Sae Wildlife Sanctuary
  • Mae On District, Chiang Mai
  • Mae Suai District, Chiang Rai
  • Mae Taeng District, Chiang Mai
  • Mae Wong National Park
  • Mueang Chiang Mai District, Chiang Mai
  • Mueang Pan District, Lampang
  • Omkoi District, Chiang Mai
  • Phu Hin Rong Kla National Park
  • Phu Khiao Wildlife Sanctuary
  • Phu Luang Wildlife Sanctuary
  • Sangkhla Buri District, Kanchanaburi
Range map of Plagiopholis nuchalis in Thailand