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Hebius metusia (INGER, ZHAO, SHAFFER & WU, 1990)

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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Wa Shan Keelback
Chinese: 瓦屋山腹链蛇 
SynonymAmphiesma metusia INGER, ZHAO, SHAFFER & WU 1990
Amphiesma metusium — DAVID, VOGEL & PAUWELS 1998
Amphiesma metusia — DAVID & DAS 2003
Amphiesma metusia — DAVID et al. 2007
Hebius metusium — GUO et al. 2014
Amphiesma metusiua — WALLACH et al. 2014: 31
Hebius metusius — ZHOU et al. 2019
Hebius metusia — DAVID et al. 2021 
DistributionChina (Sichuan)

Type locality: Wa Shan, Hongya County, Sichuan Province,
China, 1200 m elevation.  
TypesHolotype: CIB, Field No. 36982 
DiagnosisDiagnosis: This new form shares the following characters with a number of Chinese species of Amphiesma: a black stripe at side of belly formed by a spot in lateral fourth of each ventral, a light streak on temporal area separated from eye, 19 scale rows reducing to 1 7 near end of body and 8 supralabials. The new species differs from the other Chinese Amphiesma by having (1) a bold pattern ofalternating rows ofblack squares (not found in any other Chinese Amphiesma); (2) 159-164 ventrals in females (differing from craspedogaster, johannis, miyajimae, optata, parallela, and vibakari); (3) 72-85 subcaudals (differing from johannis, miyajimae, optata, parallela, and vibakari); and (4) dorsal head plates with a mottled pattern lacking a pair of small, dark-edged, light spots on the parietals (spots present in most species of Amphiesma). 
CommentZhao & Adler used both Shaffer and Schaffer. 
EtymologyNamed after the Greek noun “Metousia”, meaning partnership. 
  • CAI Guo, YANG Nan 2008. Rediscovery of Amphiesma metusium. Sichuan Journal of Zoology 27 (2): 238-238 - get paper here
  • 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. & Das, I. 2003. A new species of the snake genus Amphiesma (Serpentes: Colubridae: Natricinae) from Western Sumatra, Indonesia. Raffles Bulletin of Zoology 51(2): 413-419 - 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; GERNOT VOGEL, TRUONG QUANG NGUYEN, NIKOLAI L. ORLOV, OLIVIER S. G. PAUWELS, ALEXANDRE TEYNIÉ, THOMAS ZIEGLER 2021. A revision of the dark-bellied, stream-dwelling snakes of the genus Hebius (Reptilia: Squamata: Natricidae) with the description of a new species from China, Vietnam and Thailand. Zootaxa 4911: 1–61 - 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
  • Inger R F; Zhao E; Bradley Shaffer H; Guanfu Wu 1990. Report on a collection of amphibians and reptiles from Sichuan, China. Fieldiana: Zoology (No. 58) : i-iii, 1-24 - 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, 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
  • 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, 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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