Oligodon rostralis NGUYEN, TRAN, NGUYEN, NEANG, YUSHCHENKO & POYARKOV, 2020
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Oligodon rostralis
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| Higher Taxa | Colubridae, Colubrinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | E: Long-snouted kukri snake Vietnamese: Răn khiêm mõm dài Russian: Dlinnorylyi oligodon |
| Synonym | Oligodon rostralis NGUYEN, TRAN, NGUYEN, NEANG, YUSHCHENKO & POYARKOV 2020 |
| Distribution | S Vietnam (Lam Dong) Type locality: Bidoup–Nui Ba National Park, ca. 6 km northwards from Da Nhim village, Da Chais Commune, Lac Duong District, Lam Dong Province, southern Vietnam (12.1518°N, 108.5279°E; elevation 1,622 m a.s.l.), |
| Reproduction | |
| Types | Holotype. SIEZC 20201, adult male, collected on a steep slope near to mountain summit in montane evergreen pine forest by Bang Van Tran and Linh Hoang Nguyen at 23 h on June 13, 2017. |
| Diagnosis | Diagnosis: The new species is assigned to the genus Oligodon Fitzinger, 1826 on the basis of its phylogenetic position and the following morphological attributes: posterior maxillary teeth enlarged and compressed; head short, barely distinct from neck; eye well-developed with round pupil; rostral enlarged; body cylindrical with smooth scales; ventrals rounded; subcaudals paired. Oligodon rostralis sp. nov. is distinguished from its congeners by a combination of the following morphological characters: medium size in adults (male TL = 582 mm); head small and broad with long largely protruding snout; 15 dorsal scale rows at neck and midbody and 13 rows before vent; ventrals 167, subcaudals 47 in male; single preocular, single postocular; loreal and presubocular absent; six supralabials, third and fourth entering orbit; six infralabials, anterior four contacting chin shields; internasals separate from prefrontals; nasal divided; single anterior and two posterior temporals; cloacal plate undivided; comparatively short hemipenis, forked in anterior one third of their length, extending to 8th subcaudal, lacking spines and papillae, bearing prominent transverse flounces and distal calyces; six maxillary teeth, the posterior three being enlarged; dark temporal streak present, edged with white; 14+4 large dark-brown dorsal blotches; bright-orange vertebral stripe on tail and dorsum; and ventral surfaces in life cream with quadrangular spots. |
| Comment | HAbitat: The type specimen was collected on the steep slope close to the mountain summit, at late night (23 h). The animal was found on ground in leaf litter on the edge of the mixed-pine forest (dominated by Pinus keysia Royle ex Gordon) and evergreen montane broadleaf forest (dominated with trees of the families Fabaceae, Fagaceae, and few large pine trees of Pinus keysia, with understory consisting mostly of Poaceae –different species of bamboo). Sympatry: Cyrtodactylus bidoupimontis, Scincella rufocaudata, Pareas hamptoni. Phylogenetic position. Oligodon rostralis sp. nov. is a sister species of O. annamensis, from which it is genetically divergent with p-distance 3.3% in 16S rRNA gene. |
| Etymology | The specific name ‘‘rostralis’’ is a Latin adjective in the nominative singular, masculine gender, derived from Latin words ‘‘rostrum’’ for ‘‘snout’’ or ‘‘beak’’ in reference to protruding snout distinctive for the new species. |
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