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Hebius metusium (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 
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. J. 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
  • 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.
  • 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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