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) Unfortunately we had to temporarily remove additional information as this was scraped by multiple AI companies who sell that data to their customers. These details, e.g. detailed descriptions or comparisons (about 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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