Hebius chapaensis (BOURRET, 1934)
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Hebius chapaensis
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| Higher Taxa | Colubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | E: Vietnam Water Snake Chinese: 沙坝腹链蛇 |
| Synonym | Pararhabdophis chapaensis BOURRET 1934 Pararhabdophis chapaensis — SMITH 1943: 316 Pararhabdophis chapaensis — NGUYEN et al. 2009 Pararhabdophis chapaensis — WALLACH et al. 2014: 533 Hebius chapaensis — KIZIRIAN et al. 2018 Hebius chapaensis — REN et al. 2018 Hebius chapaensis — DAVID et al. 2021: 23 |
| Distribution | Vietnam (Lao Cai, Yen Bai, Cao Bang, Dien Bien, Son La, Thanh Hoa), China (Yunnan), Laos (Houaphan, Luangphrabang, Xaisomboun, Vientiane) Type locality: Chapa, Tong-King (= Sa Pa, Lao Cai Province, North Vietnam) |
| Reproduction | |
| Types | Holotype: MNHN-RA 1938.0125 |
| Diagnosis | Diagnosis: A moderately sized species of the genus Hebius characterized by the combination of (1) a body elongate in both sexes; (2) head distinct from the neck; (3) 17–18 (rarely 19)-17-17 dorsal scale rows, distinctly keeled at midbody, strongly keeled posteriorly, especially before vent but smooth or feebly keeled on the 1st dorsal scale row; (4) scales around the base of the tail very strongly keeled; (5) eye average with a pupil variable in shape, i.e., usually round but also elliptic or even asymmetrically and irregularly shaped, 1.0–1.2 times the distance be- tween the lower margins of eye and of lip; (6) 29–34 maxillary teeth, progressively increasing in size in a continu- ous series, the last two or three abruptly and strongly enlarged, not separated from anterior teeth by a diastema; (7) nostrils piercing laterally or slightly dorsolaterally; (8) tail long but with a ratio Tal/TL lower than 0.30; (9) 159–177 VEN; (10) 90–114 subcaudals, paired; (11) internasals abruptly truncated; (12) 2 prefrontal scales, (13) 1 anterior temporal, (14) venter dark, blackish-brown or black, with some paler, more or less faint longitudinal streaks and sometimes a pale blotch or streak on the outer margin of ventrals; (15) background colour dark brown or blackish- brown; (16) dorsal pattern made of more or less elongate cream, pale yellow or pale orange-brown blotches on a faint dorsolateral stripe; (17) an elongate, cream or pale ochre-yellow blotch, or isolated blotches on the nape; (18) a strong postocular streak; (19) upper head surface with strong, yellow vermiculations; and (20) supralabials cream, ochre-yellow or pale yellowish-brown, edged with dark brown, or divided into a pale and dark area (David et al. 2021). |
| Comment | Type species: Pararhabdophis chapaensis BOURRET 1934 is the type species of the genus Pararhabdophis BOURRET 1934. Synonymy: Kizirian et al. 2018 and Ren et al. 2018 synonymized Parahelicops with Hebius. |
| Etymology | Named after the type locality. |
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