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Hebius octolineatus (BOULENGER, 1904)

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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Eight-lined Keelback
Chinese: 八线腹链蛇 
SynonymTropidonotus octolineatus BOULENGER 1904: 133
Tropidonotus quadrilineatus BOULENGER 1904: 132
Tropidonotus pleurotaenia BOULENGER 1904: 133
Tropidonotus parallelus var. sublaevis DESPAX 1913
Natrix septemlineata SCHMIDT 1925
Natrix octolineata — MELL 1931 [1929]
Natrix nigroreticulata CHANG 1932
Amphiesma octolineata – MALNATE 1960
Amphiesma octolineatum — DAVID, VOGEL & PAUWELS 1998
Natrix octolineata — ZHOU 2002
Amphiesma octolineatum — DAVID et al. 2007
Hebius octolineatum — GUO et al. 2014
Amphiesma octolineatum — WALLACH et al. 2014: 31
Hebius octolineatus — ZHOU et al. 2019 
DistributionSW China (Yunnan, Sichuan, Guangxi)

Type locality: Yunnan Fu (=Kunming Shi), Yunnan Prov., China; about 6,000 feet elevation.  
TypesType: BMNH 1946.1.12.60 (and possibly additional specimens). 
DiagnosisDiagnosis: Hebius octolineatus can be distinguished from its recognized congeners by a combination of the following characters: (1) TaL/ToL 20.7%–25.9%; (2) internasals narrowed anteriorly; (3) nasal divided, each half in contact with each other; (4) nostrils lateral; (5) loreal almost quadrilateral, higher than wide, not entering orbit; (6) supralabials usually eight; (7) preocular one or two; (8) postoculars three; (9) infralabials nine or ten, first pair in contact with each other, first–fifth infralabials in contact with anterior chin shields; (10) mental triangles; (11) dorsal scales rows 19-19-17; (12) dorsal scale rows reduced from 19 to 17 at position of third and fourth dorsal scale rows and from 81st to 86th ventrals; (13) ventrals 150–154; (14) subcaudals 70–80, paired; (15) anal divided; (16) four dorsal stripes on each side, not including ventrolateral stripe, two yellow and two grayish-black; (17) black zigzag lateral line, formed by outer edges of ventral shields; and (18) venter pale yellow (from Hou et al. 2021, based on n = 5). 
CommentPope (1935, Rept. China: 114), acting as first revisor, chose octolineatus in preference to quadrilineatus and pleurotaenia.

Similar species: Hebius septemlineatus 
EtymologyNamed after Latin octo = eight, and linea = line. 
  • Boulenger, GEORGE A. 1904. Descriptions of new frogs and snakes from Yunnan. Ann. Mag. Nat. Hist. (7) 13 (74): 130-134 - get paper here
  • Chang, MANG-VEN L.-Y. 1932. Notes on a collection of reptiles from Szechuan. Contr. Biol. Lab. Sci. Soc. China, Nanking, ser. Zool., 8 (2): 9-95
  • David P., G. Vogel & Pauwels,O. 1998. Amphiesma optatum (Hu & Djao, 1966) (Serpentes, Colubridae): an addition to the snake fauna of Vietnam, with a list of the species of the genus Amphiesma and a note on its type species. Journal of Taiwan Museum 51 (2): 83-92 - get paper here
  • David, P., Bain, R. H., Nguyen Quang Truong, Orlov, N. L., Vogel, G., Vu Ngoc Thanh & T. Ziegler 2007. A new species of the natricine snake genus Amphiesma from the Indochinese Region (Squamata: Colubridae: Natricinae). Zootaxa 1462: 41-60 - get paper here
  • David, P.; Vogel, G. & Pauwels, O.S.G. 2005. On the occurrence of Amphiesma bitaeniatum (WALL, 1925) in Vietnam, with preliminary remarks on the group of Amphiesma parallelum (BOULENGER, 1890) (Serpentes, Colubridae, Natriciniae). Salamandra 41 (4): 167-178 - get paper here
  • DAVID, PATRICK; ISHAN AGARWAL, RAMANA ATHREYA, ROSAMMA MATHEW,<br />GERNOT VOGEL & VIRAL K. MISTRY 2015. Revalidation of Natrix clerki Wall, 1925, an overlooked species in the genus Amphiesma Duméril, Bibron & Duméril, 1854 (Squamata: Natricidae). Zootaxa 3919 (2): 375–395 - get paper here
  • Despax, RAYMOND 1913. Sur une collection de reptiles et de batraciens rassemblée par M. le Dr. Legendre dans les marches Thibétaines. Bull. Mus. Hist. Nat., Paris, [ser. 1], 19 (4): 179-183 - get paper here
  • GUO, PENG; FEI ZHU, QIN LIU, LIANG ZHANG, JIAN X. LI, YU Y. HUANG & R. ALEXANDER PYRON 2014. A taxonomic revision of the Asian keelback snakes, genus Amphiesma (Serpentes: Colubridae: Natricinae), with description of a new species. Zootaxa 3873 (4): 425–440 - get paper here
  • 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
  • Mell,R. 1931. List of Chinese snakes. Lingnan Sci. Jour., Canton, 8 [1929]: 199-219.
  • Schmidt, KARL P. 1925. New Chinese amphibians and reptiles. American Museum Novitates (175): 1-3. - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. [type catalogue] Taylor and Francis, CRC Press, 1237 pp.
  • 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
  • Wang, Kai; Jinlong Ren, Hongman Chen, Zhitong Lyu, Xianguang Guo Ke Jiang, Jinmin Chen, Jiatang Li, Peng Guo, Yingyong Wang, Jing Che 2020. The updated checklists of amphibians and reptiles of China. Biodiversity Science 28 (2): 189-218 - get paper here
  • Yang, J.-H., X.-Y. Huang, J.-F. Ye, S.-P. Yang, X.-.C. Zhang & B.P.-L. Chan 2019. A report on the herpetofauna of Tengchong Section of Gaoligongshan National Nature Reserve, China. Journal of Threatened Taxa 11(11): 14434–14451 - get paper here
  • Zhao, E.M. 2006. The snakes of China [in Chinese]. Hefei, China, Anhui Sience & Technology Publ. House, Vol. I, 372 pp., Vol. II (color plates), 280 pp.
  • Zhao,E. & Adler,K. 1993. Herpetology of China. SSAR, Oxford/Ohio, 1-522
  • Zhou Kaiya 2002. Herpetologica Sinica 9. China Scientific Book Services, 235 pp. - get paper here
  • ZHOU, ZHENGYAN; ZHIYONG SUN, SHUO QI, YUYAN LU, ZHITONG LYU, YINGYONG WANG, PIPENG LI, JIANZHANG MA 2019. A new species of the genus Hebius (Squamata: Colubridae: Natricinae) from Hunan Province, China. Zootaxa 4674 (1): 068–082 - get paper here
  • Ziegler, T., and Quyet, L.K. 2006. A new natricine snake of the genus Amphiesma (Squamata: Colubridae: Natricinae) from the central Truong Son, Vietnam. Zootaxa 1225: 39-56 - get paper here
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