Colubroelaps nguyenvansangi ORLOV, KHARIN, ANANJEVA, NGUYEN & NGUYEN, 2009
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Colubroelaps nguyenvansangi
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| Higher Taxa | Colubridae, Sibynophiinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | English: Nguyenvansang’s Snake. Vietnamese: Ran nguyen van sang |
| Synonym | Colubroelaps nguyenvansangi ORLOV, KHARIN, ANANJEVA, NGUYEN & NGUYEN in ORLOV et al. 2009 Colubroelaps nguyenvansangi — WALLACH et al. 2014: 175 |
| Distribution | Vietnam (Lam Dong, Binh Phuoc) Type locality: Loc Bac Forest Enterprise, Lam Dong Province, southern Vietnam (elevation 720 m, 11°47’07’’ N, 107° 36’ 14’’ E). |
| Reproduction | |
| Types | Holotype: ZISP/IEBR 25682, female collected by Nguyen Van Sang in May 2003. |
| Diagnosis | Diagnosis (genus and species): Colubroelaps is unique among Southeast Asian snakes in having the following combination of characters: it is not large, very thin colubrid snake with elapsoid morphotype; body vermiform round in crosssection, total length — 500 mm (snout-vent length 393 mm, tail length from vent to tip 107 mm). This snake has great similarity with elapid snakes of Elapinae subfamily (Calliophis, Maticora, Sinomicrurus) but has no fangs and venomous glands (Figs. 5 and 6 in ORLOV et al. 2009). Tiny small head is roundish and short, not distinguished from the body, slightly dorso-ventrally depressed and covered by large regular shields. Eyes are very small with round pupil. No loreal shield (Figs. 7 and 8). Dorsal scales uniform, rhomboid, tile-shaped, smooth; the number of scale rows around the body is almost equal along all the length of body (Sq1 — 15, Sq2 — 15, Sq3 — 15, Sq around anus — 13); anal plate divided (Figs. 9 – 13). Maxillae slightly arched, long, longer than palatinum and hardly shorter than pterygoideum; it is situated far forward behind palatinum in horizontal plane, directed far backwards under the orbit and join praefrontale at a big distance from its frontal end. Palatinum with external process, joined with internal process of maxillae. Pterygoideum with triangular hollow for palatinum; accordingly palatinum has triangular projection for pterygoideum its lower part. Maxillae with 14 teeth, heterodonty is not developed; no diastema between teeth. Palatinum has 7 teeth, perygoideum — 7 teeth, dentale — 12 (right) and 12 (left). Frontale oval, wideroundish. Parietale almost rectangular laterally. Quadratum is oriented downwards and forward, joins with pterygoideum. There are 279 trunk vertebrae and 83 caudal vertebrae. Hypapophyses are developed only in anterior trunk vertebrae (Figs. 14 – 19). |
| Comment | Type species: Colubroelaps nguyenvansangi ORLOV et al. 2009 is the type species of the genus Colubroelaps ORLOV, KHARIN, ANANJEVA, NGUYEN & NGUYEN 2009. |
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