Thai National Parks

Reptiles of Thailand

Species of Thailand

Collared blackhead

Binomial name: Sibynophis collaris (John Edward Gray, 1853)

Sibynophis collaris, commonly known as the common many-toothed snake or the collared black-headed snake, is a species of colubrid snake endemic to South Asia.


Rostral scale twice as broad as deep, just visible from above; suture between the internasals shorter than that between the prefrontals; frontal longer than its distance from the end of the snout, as long as the parietals or shorter; loreal as long as or a little longer than deep; one preocular; two postoculars, only the upper in contact with the parietal; temporals 1 (or 2) + 2; 9 or 10 upper labials, fourth, fifth, and sixth entering the eye; 4 lower labials in contact with the anterior chin shields, which are as long as the posterior chin shields. Dorsal scales smooth, without apical pits, in 17 rows. Ventrals 159-190; anal divided; subcaudals divided, 102-131.

Brown above, vertebral region greyish, usually with a series of small round black spots; head with small black spots or vermiculations above, and two black crossbands, one across the posterior part of the frontal and supraoculars, the other across the occiput; a large black nuchal spot or crossband, bordered with yellow posteriorly; a black line from the nostril to the nuchal spot, passing through the eye, bordering the white black-dotted upper lip. Lower parts yellowish, each ventral with an outer black spot or streak, which may be confluent on the posterior part of the body; anterior ventrals with a pair of median dots in addition.

Total length 29 inches (737 mm); tail 9.5 inches (241 mm).


Sub-Himalayan India (Assam, Simla), Mizoram, Bangladesh, Nepal, Myanmar (Burma), Thailand, Laos, Vietnam, Cambodia, West Malaysia, China (SE Tibet and Yunnan), Taiwan and island of Jeju in South Korea (Type locality:Khasi Hills, India)

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Scientific classification

Sibynophis collaris

Common names

  • German: Halsbinden-Vielzahnnatter
  • English: Collared blackhead, Common blackhead, Common many-tooth snake
  • Thai: งูคอขวั้นดำ


  • Sibynophis collaris, Van Stanley Bartholomew Wallach et al. (2014)
  • Sibynophis collaris, Nguyen Van Sang et al. (2009)
  • Sibynophis collaris, Merel J. Cox et al. (1998)
  • Sibynophis collaris, Ulrich Manthey & Wolfgang Grossmann (1997)
  • Sibynophis collaris, Malcolm Arthur Smith (1943)
  • Sibynophis collaris, Malcolm Arthur Smith (1930)
  • Polyodontophis collaris, Frank Wall (1908)
  • Polyodontophis collaris, George Albert Boulenger (1893)
  • Coluber colubrinus, Edward Blyth (fide Philip Lutley Sclater) (1891)
  • Polyodontophis collaris, George Albert Boulenger (1890)
  • Ablabes collaris, Ferdinand Stoliczka (1871)
  • Ablabes collaris, Albert Charles Lewis Günther (1858)
  • Psammophis collaris, John Edward Gray (1853)

Collared blackhead is found in following locations in Thailand

Please note that this non-official list is not complete nor necessarily accurate. This list is a summary of checklists from other websites, blogs, publications, photo/videos published on various websites or our own findings. We appreciate your contributions with photo proof.

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)

Distribution map of Collared blackhead, Sibynophis collaris in Thailand

Range map of Sibynophis collaris in Thailand

Important note; our range maps are generated automatically based on very limited data we have about the protected sites, the data is not necessarily accurate. Please help us to improve our range maps by sharing your findings/knowledge.