Homalopsis nigroventralis DEUVE, 1970
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Homalopsis nigroventralis
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| Higher Taxa | Homalopsidae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | E: Deuve’s Water Snake |
| Synonym | Homalopsis 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 |
| Distribution | Laos, 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. |
| Reproduction | ovovivparous. |
| Types | Holotype: lost (presumed), Deuve’s specimens presumed lost in a fire. |
| Diagnosis | Diagnosis: 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. |
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