Thai National Parks

Reptiles of Thailand

Species of Thailand

Keel-bellied water snake

Binomial name: Bitia hydroides (John Edward Gray, 1842)

The keel-bellied water snake (Bitia hydroides) is a marine homalopsine snake. It belongs to the monotypic genus Bitia.

Geographic range

It is found in Malaysia.


Bitia hydroides is noted for its unusual dentition. In all other snakes, any enlarged teeth are located on the dentary or maxilla, with the inner, palatine teeth of the upper jaw being smaller. In Bitia hydroides, the palatine teeth are greatly enlarged. Not enough is known about this animal's feeding behavior or ecology to attempt to infer a function of this peculiar arrangement.

This article uses material from the Wikipedia released under the Creative Commons Attribution-Share-Alike Licence 3.0. Please see license details for photos in photo by-lines.

Scientific classification

Bitia hydroides

Common names

  • German: Wasser-Schuppenkopf
  • English: Keel-bellied water snake, Gray's water snake, The bitia
  • Thai: งูปากกว้างท้องสัน


  • Bitia hydroides, John C. Murphy & Harold Knight Voris (2014)
  • Bitia hydroides, Van Stanley Bartholomew Wallach et al. (2014)
  • Biotia hydroides, Lu et al. (2006)
  • Bitia hydroides, Ulrich Manthey & Wolfgang Grossmann (1997)
  • Bitia hydroides, Malcolm Arthur Smith (1943)
  • Homalopsis hydrina, fide Malcolm Arthur Smith (1943)
  • Hipistes hydrinus, Norman Smedley (1931)
  • Hipistes hydrinus, John Anderson (1871)
  • Hipistes hydrinus, Ferdinand Stoliczka (1870)
  • Hypistes hydrinus, Albert Charles Lewis Günther (1864)
  • Hipistes fasciatus, John Edward Gray (1849)
  • Bitia hydroides, John Edward Gray (1842)

Keel-bellied water snake 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.

  • Bangkok Coast

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)

No photo for this species yet

Distribution map of Keel-bellied water snake, Bitia hydroides in Thailand
  • Bangkok Coast

Range map of Bitia hydroides 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.