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Homalopsis nigroventralis DEUVE, 1970

IUCN Red List - Homalopsis nigroventralis - Least Concern, LC

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Higher TaxaHomalopsidae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Deuve’s Water Snake 
SynonymHomalopsis buccata nigroventralis DEUVE 1970
Homalopsis buccata — TAYLOR & ELBEL 1958: 1159
Homalopsis buccata — TAYLOR 1965: 923
Homalopsis buccata — GYI 1970: 136
Homalopsis nigroventralis — STUART et al. 2006
Homalopsis nigroventralis — MURPHY 2007
Homalopsis nigroventralis — MURPHY et al. 2012
Homalopsis nigroventralis — MURPHY & VORIS 2014: 25
Homalopsis nigroventralis — WALLACH et al. 2014: 335 
DistributionLaos, Cambodia, and Thailand (Mekong River)

Localities: 14°15'08.0" N, 106°37'58.8" E, 175 m elevation, 14°10'39.2" N, 107°17'25.1" E, 150m elevation; CAMBODIA – Ta Veng FMNH 263029 (Virachey National Park, O Lopeung stream, 14°10'39.2" N, 107°17'25.1" E, 150 m); Siem Pang FMNH 263030 (Virachey National Park, O Kanome stream, 14°13'33.7" N, 106°36'16.0" E, 170 m), FMNH 2630301-32 (Virachey National Park, O Kanome stream, 14°15'08.0" N, 106°37'58.8" E, 175 m), FMNH 263033 (Virachey National Park, 14°12'53.8" N, 106°35'51.3" E, 100 m); Nong Khai FMNH 265801 (Phu Wua Wildlife Sanctuary, Houay Sod waterfall, 18°15'51.4" N, 103°54'22.1" E, 160 m), MNHN 1988.2104; THAILAND – Phan Phu Mt. FMNH 179239, 117858-60 [MURPHY et al. 2012].

Type locality: Ngum River Valley, Laos.  
TypesHolotype: lost (presumed), Deuve’s specimens presumed lost in a fire. 
DiagnosisDiagnosis. Homalopsis nigroventralis has upper labials 1–3 contacting the loreal; two prefrontals; 35–39 dorsal scale rows at midbody, reduced to 30 or less; one or two postocular scales plus one postsubocular scale; 10–12 upper labials; 159–167 ventrals; and a reverse color pattern on the venter (dark olive-gray with white spots). Homalopsis buccata has upper labials 1–4 contacting the loreal; one postocular scale plus a postsubocular scale; a ventral pattern that is light with dark spots. Homalopsis hardwickii has a divided loreal contacting upper labials 1– 4; one postocular scale and no presubocular scale. Homalopsis semizonata has a divided or fragmented loreal contacting upper labials 1–4 or 1–5; three prefrontals; 39–44 dorsal scale rows at midbody, reduced to more than 30 posteriorly; one postocular and one postsubocular. The new species, H. mereljcoxi has a single loreal contacting upper labials 1–4; 40–47 scale rows at midbody, reduced to 30 or more posteriorly; 13 (12–14) upper labials; and ventral counts that are usually greater than 165. 
  • Chan-ard, T., Parr, J.W.K. & Nabhitabhata, J. 2015. A field guide to the reptiles of Thailand. Oxford University Press, NY, 352 pp. [see book reviews by Pauwels & Grismer 2015 and Hikida 2015 for corrections] - get paper here
  • Deuve, J. 1970. Serpents du Laos. Office de la Recherche Scientifique et Technique Outre-Mer, Paris, Mem. no. 39 251 pp. - get paper here
  • Murphy, J.C. & Voris, H.K. 2014. A Checklist and Key to the Homalopsid Snakes (Reptilia, Squamata, Serpentes), with the Description of New Genera. FIELDIANA: LIFE AND EARTH SCIENCES (8): 1–43 - get paper here
  • Murphy, John C. 2007. Homalopsid Snakes: Evolution in the Mud. Krieger Publishing, Malabar, Florida, 249 pp.
  • MURPHY, JOHN C.; HAROLD K. VORIS, B.H.C.K. MURTHY, JOSHUA TRAUB & CHRISTINA CUMBERBATCH 2012. The masked water snakes of the genus Homalopsis Kuhl & van Hasselt, 1822 (Squamata, Serpentes, Homalopsidae), with the description of a new species. Zootaxa 3208: 1–26 - get paper here
  • Stuart, B.; Sok, K. & Neang, T. 2006. A collection of amphibians and reptiles from hilly Eastern Cambodia. Raffles Bull. Zool. 54 (1): 129-155 - get paper here
  • Taylor, Edward H. & Elbel, Robert E. 1958. Contribution to the Herpetology of Thailand. Univ. Kansas Sci. Bull. 38 (13): 1033-1189 - get paper here
  • Taylor,E.H. 1965. The serpents of Thailand and adjacent waters. Univ. Kansas Sci. Bull. 45 (9): 609-1096 - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. [type catalogue] Taylor and Francis, CRC Press, 1237 pp.
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