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Chanard’s Mud Snake

23 Apr

Enhydris chanardi

Chanard's Water Snake Enhydris chanardi

Chanard’s Mud Snake found in Nakhon Nayok Province (photo by Exotarium Oberhof)

Chanard's Mud Snake Enhydris chanardi scales

A comparison of the color patterns of Chanard’s Mud Snake and Jagor’s Water Snake (photo by John C. Murphy)

Sind River Snake Enhydris chanardi scales

Head scales of preserved Chanard’s Mud Snake (photo by John C. Murphy)

English name: Chanard’s Mud Snake (aka “Sind River Snake”)
Scientific name: Enhydris chanardi
Thai name: ngu sai rung lai Chan-Ard

Description: To 55cm long. A very short, thick water snake. Head is broad and mottled with yellow and grayish-brown coloration. Body is grayish-brown above. There is a pale stripe on each side with a row of small dark dots running just above it. Underbelly is pale with a grayish zig-zag line on the edges.

Similar Species: Jagor’s Water Snake lacks the pale stripe and has large dark blotches rather than small dark dots.
Mekong Mud Snake has its dark spots higher up on the sides, though scale counts may be necessary to tell them apart.

Habitat: This snake is found in freshwater bodies in the Chao Phraya drainage. Like other members of its family, it likely spends nearly all of its time in the water.

Place in the ecosystem: Living populations have not yet been studied, but it likely feeds on fish and frogs. Would be eaten by larger snakes, large fish, monitors, and wading birds.

Danger to humans: Is a rear-fanged snake like other members of its family, but is not dangerous to humans.

Conservation status and threats: This species was recently described from 15 museum specimens, all of which came from Metropolitan Bangkok or the surrounding area. The most recent of these records was about 20 years old. There are concerns that development in Bangkok may have destroyed much of its habitat and it may be extinct in Bangkok. The above photograph from Nakhon Nayok Province represents the most recently seen living specimen.

Interesting facts: New species are not always found out in the wild. This species was discovered in 2005 by two biologists who examined Jagor’s Water Snake specimens from many museums and discovered that a number of the records were actually mislabeled and represented a previously unknown species. The species was described from these museum specimens, the most recent of which was nearly twenty years old and some of which had been collected a hundred years earlier.

Unfortunately, the Chanard’s Mud Snake might be gone almost as soon as it was discovered. Nearly all of the museum specimens of the species come from Bangkok, which is a tough place for water snakes to live due to its high degree of development. It is possible that some Chanard’s Mud Snakes persist in Bangkok, but their status may be fragile. Hopefully the more rural surrounding provinces have enough of the species in less developed areas that it will be able to survive.

References:
A New Thai Enhydris
A Checklist and Key to the Homalopsid Snakes with the Description of New Genera
IUCN Redlist: Enhydris chanardi
Thai National Parks: Chan-ard’s Mud Snake
Michael Cota, personal communication
John C. Murphy, personal communication
A Field Guide to the Reptiles of South-East Asia

 

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