Thai National Parks

Species of Thailand

Eastern Russell's viper

Daboia siamensis, Malcolm Arthur Smith, 1917

(In Thai: งูแมวเซา, ngu meow sao)

Daboia siamensis (Common name: Eastern Russell's viper, Siamese Russell's viper, more) is a venomous viper species that is endemic to parts of Southeast Asia, southern China and Taiwan. It was formerly considered to be a subspecies of Daboia russelii (as Daboia russelli siamensis), but was elevated to species status in 2007.


Dorsally, the color pattern is the same as that of D. russelii, except that the color is more grayish or olive, with small spots between the large spot rows. The venter is suffused with gray posteriorly.

Common names

Eastern Russell's viper, Siamese Russell's viper.

Previously, other common names were used to describe subspecies that are now part of the synonymy of this form: Indonesian Russell's viper for "limitis", and Formosan Russell's viper for "formosensis".

Geographic range

D. siamensis is found in Myanmar, Thailand, Cambodia, China (Guangxi, Guangdong), Taiwan and Indonesia (Endeh, Flores, east Java, Komodo, Lomblen Islands).

Brown (1973) mentions that D. siamensis can also found in Vietnam, Laos and on the Indonesian island of Sumatra. Ditmars (1937) reportedly received a specimen from Sumatra as well. However, its distribution in the Indonesian archipelago is still being elucidated.


A monovalent antivenin, called "Russell's Viper Antivenin", is made in Thailand by the Thai Red Cross to counteract the venom of this species.

This article uses material from Wikipedia released under the Creative Commons Attribution-Share-Alike Licence 3.0. Eventual photos shown in this page may or may not be from Wikipedia, please see the license details for photos in photo by-lines.

Scientific classification

Daboia siamensis

Common names

  • German: Östliche Kettenviper
  • English:
    • Eastern Russell’s viper
    • Siamese Russell's viper
  • Thai: งูแมวเซา, ngu meow sao


  • Daboia siamensis, Van Stanley Bartholomew Wallach et al. (2014)
  • Daboia siamensis, Roger Stephen Thorpe et al. (2007)
  • Daboia russelii siamensis, Ermi Zhao (2006)
  • Daboia russellii sic siamensis, Tanya Chan-Ard et al. (1999)
  • Daboia russelii siamensis, Merel J. Cox et al. (1998)
  • Daboia russelli siamensis, WELCH (Multiple authors) (1994)
  • Daboia russelli siamensis, Golay et al. (1993)
  • Vipera russelli burmanus, Maung Maung Aye in P. Gopalakrishnakone & Tan (1987)
  • Vipera russelli siamensis, K. Nakada, F. Nakada, E. Ito & F. Inoue (1984)
  • Viper russelli siamensis, Sakuragawa (1979)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)


Please help us review our species pages if wrong photos are used or any other details in the page is wrong. We can be reached via our contact us page.

Daboia siamensis
Siamese Russell's viper
Siamese Russell's viper

Range Map

Distribution map of Eastern Russell's viper, Daboia siamensis in Thailand
  • Aranyaprathet District, Sa Kaeo
  • Ban Mi District, Lopburi
  • Bang Len District, Nakhon Pathom
  • Bang Nam Priao District, Chachoengsao
  • Bang Pa In District, Phra Nakhon Si Ayutthaya
  • Bo Phloi District, Kanchanaburi
  • Bueng Sam Phan District, Phetchabun
  • Chai Badan District, Lopburi
  • Dan Chang District, Suphan Buri
  • Hankha District, Chainat
  • Huai Kha Khaeng Wildlife Sanctuary
  • Kabin Buri District, Prachinburi
  • Khao Chakan District, Sa Kaeo
  • Khlong Hat District, Sa Kaeo
  • Khlong Luang District, Pathum Thani
  • Khok Charoen District, Lopburi
  • Khok Samrong District, Lopburi
  • Ko Chan District, Chonburi
  • Lao Khwan District, Kanchanaburi
  • Lat Yao District, Nakhon Sawan
  • Manorom District, Chainat
  • Mueang Lopburi District, Lopburi
  • Mueang Nakhon Sawan District, Nakhon Sawan
  • Mueang Sa Kaeo District, Sa Kaeo
  • Mueang Uthai Thani District, Uthai Thani
  • Nong Khaem District, Bangkok
  • Nong Mamong District, Chainat
  • Nong Ya Sai District, Suphan Buri
  • Ongkharak District, Nakhon Nayok
  • Phachi District, Phra Nakhon Si Ayutthaya
  • Phanat Nikhom District, Chonburi
  • Phanom Sarakham District, Chachoengsao
  • Phatthana Nikhom District, Lopburi
  • Phayuha Khiri District, Nakhon Sawan
  • Prachantakham District, Prachinburi
  • Sa Bot District, Lopburi
  • Sai Noi District, Nonthaburi
  • Sai Thong Watthana District, Kamphaeng Phet
  • Sanam Chai Khet District, Chachoengsao
  • Sao Hai District, Saraburi
  • Sawang Arom District, Uthai Thani
  • Si Maha Phot District, Prachinburi
  • Si Thep District, Phetchabun
  • Tak Fa District, Nakhon Sawan
  • Takhli District, Nakhon Sawan
  • Tha Tako District, Nakhon Sawan
  • Thanyaburi District, Pathum Thani
  • U Thong District, Suphan Buri
  • Uthai District, Phra Nakhon Si Ayutthaya
  • Wang Nam Yen District, Sa Kaeo
  • Wang Noi District, Phra Nakhon Si Ayutthaya
  • Watthana Nakhon District, Sa Kaeo
  • Wichian Buri District, Phetchabun
Range map of Daboia siamensis in Thailand