Lycodon chapaensis (ANGEL & BOURRET, 1933)
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Lycodon chapaensis
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| Higher Taxa | Colubridae, Colubrinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | E: Namdong Wolf Snake G: Namdong Wolfszahnnatter Vietnamese: Rắn khuyết nam động |
| Synonym | Dinodon septentrionale chapaense ANGEL & BOURRET 1933: 131 Dinodon septentrionale chapaensis — BOURRET 1934: 133 Dinodon septentrionale chapaense — BOURRET 1935: 6 Dinodon septentrionale var. chapaense — DEUVE 1961: 16 Dinodon septentrionale — ZHAO & YANG 1997 Dinodon septentrionale — ZHAO et al. 1998 Dinodon septentrionale — HE & ZHOU 2002 Dinodon septentrionale — ZHAO, 2006 Dinodon septentrionale — YANG & RAO 2008 Lycodon septentrionalis — SILER et al. 2013 Lycodon septentrionalis — GUO et al. 2013 Lycodon septentrionalis — CAI et al. 2015 (in part) Lycodon septentrionalis — JIANG et al. 2016 Lycodon cf. septentrionalis — YANG et al. 2019 Lycodon namdongensis LUU, ZIEGLER, HA, LE & HOANG 2019 Lycodon septentrionalis — WANG et al., 2020 Lycodon chapaensis — WANG et al. 2020 Lycodon chapaense — WALLACH 2025 |
| Distribution | Vietnam (Thanh Hoa), China (Yunnan) Type locality: 20 km SW of Lao-Kay (=Lao Cai), Tonkin, Vietnam namdongensis: Type locality: karst forest, Nam Dong Nature Reserve, Quan Son District, Thanh Hoa Province, Vietnam (20°18.298’N; 104°54.776’E, at an elevation of 616 m a.s.l.) |
| Reproduction | |
| Types | Holotype: MNHN-RA-1933.0011, adult female. Collected by Bourret R. on 01 July 1931. Holotype: VNUF R.2017.23 (field number: TT 17.23), adult male, collected on 13 June 2017 by Vinh Quang Luu, Nghia Van Ha, Oanh Van Lo, and Ngoan Van Ha [namdongensis] |
| Diagnosis | Diagnosis: Lycodon chapaensis comb. nov. differs from congeners by a combination of the following characters: (1) body size large, ToL 691–1114 mm; (2) tail length moderate, TaL 17.1%–20.5% ToL; (3) dorsal scale rows 17-17-15, mostly smooth, except the posterior vertebral row, which very feebly keeled; (4) VEN 200–225; (5) SC 74–84; (6) cloacal plate entire; (7) loreal short, not entering orbit; (8) SL 7 or 8, 2-3-3, 3-2-3, or 2-2-3; (9) IL 8–10, first 4 or 5 in contact with anterior chin shield; (10) preocular single, in contact with supraocular and prefrontal; (11) postocular 2; (12) temporal 2+2 or 2+3; (13) paraparietal much enlarged, single; (14) maxillary teeth 11 or 12, forming four distinct groups separated by three gaps (3-1-1-6 or 5-1-1-5), fourth and fifth tooth largest, about 2.5 times larger than first; first gap twice as wide as between the first two teeth; second gap largest, about four times as wide as between the first two teeth; third gap in same width as in first gap; (15) hemipenis single, not forked at tip, bulbous shaped, with medium sized spines on distal end of stem, and spinose and calyculate with spinulate ridges on bulb, apical nude; (16) dorsal Jet Black (Color 300) or dark Indigo (Color 190) in life, with 23–37 white cross-bands on dorsum, 11–16 on tail; (17) cross-bands with rather clearly defined edges, not serrated or only slightly serrated, single scale width dorsally, widen ventrolaterally; and (18) ventral white, with black transverse bands or irregular speckles. (Wang et al. 2020) Additional details (7473 characters) are available for collaborators and contributors. Please contact us for details. |
| Comment | Synonymy: after Wang et al. 2020 who considered namdongensis as a synonym of chapaensis. Habitat: ground near shrubs in secondary karst forest. NCBI taxonID: 2546291 [namdongensis] |
| Etymology | The species name is derived from the type locality of this species (Chapa, = Sa Pa, in Lao Cai Province of Vietnam). |
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