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Hebius septemlineatus (SCHMIDT, 1925)

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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Tengchong Keelback Snake
Chinese: 腾冲腹链蛇 (Teng Chong Fu Lian She) 
SynonymNatrix septemlineata SCHMIDT 1925
Hebius septemlineatus — HOU et al. 2021 
DistributionSW China (W Yunnan)

Type locality: Tengyueh (now Tengchong City), Yunnan Province, China  
TypesHolotype: AMNH 21051, collected by R. C. Andrews and E. Heller in May 1917 
DiagnosisDiagnosis: Hebius septemlineatus comb. nov. can be distinguished from its recognized congeners by a combination of the following characters: (1) TaL/ToL 23.5%–25.6%; (2) internasals narrowed anteriorly; (3) nasal divided, each half in contact with each other; (4) nostrils lateral; (5) loreal almost quadrilateral, higher than width, separated from orbit; (6) supralabials usually eight; (7) preocular one or two; (8) postoculars usually three; (9) mental triangles; (10) infralabials nine or ten, first pair in contact with each other, first–fifth infralabials in contact with anterior chin shields; (11) dorsal scales 19-19-17 rows; (12) dorsal scale rows reduced from 19 to 17 at position of third and fourth dorsal scale rows and from 97th to 101st ventrals; (13) ventrals 164–175; (14) subcaudals 80–96, paired; (15) anal divided; (16) four dorsal stripes on each side, not including ventrolateral stripe; and (17) ventral pale yellow (from Hou et al. 2021, based on n = 7). 
CommentSynonymy: Pope (1935:112 synonymized Natrix septemlineata Natrix octolineatum, but Hou et al. 2021 resurrected H. septemlineatus and placed it in Hebius.

Similar species: Hebius octolineatus. 
EtymologyNamed after Latin septem = seven, and linea = line. 
  • Hou, S. B., Yuan, Z. Y., Wei, P. F., Zhao, G. G., Liu, G. H., Wu, Y. H., ... & Che, J. 2021. Molecular phylogeny and morphological comparisons of the genus Hebius Thompson, 1913 (Reptilia: Squamata: Colubridae) uncover a new taxon from Yunnan Province, China, and support revalidation of Hebius septemlineatus (Schmidt, 1925). Zoological Research, 42(5): 620-625 - get paper here
  • Schmidt, KARL P. 1925. New Chinese amphibians and reptiles. American Museum Novitates (175): 1-3. - get paper here
  • Wang K, Lyu ZT, Wang J, Qi S, Che J 2022. Updated Checklist and Zoogeographic Division of the Reptilian Fauna of Yunnan Province, China. Biodiversity Science 30 (4): 21326, 1–31 - get paper here
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