Hebius ishigakiensis (MALNATE & MUNSTERMAN, 1960)

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Higher Taxa	Colubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies
Common Names	E: Yaeyama keelback
Synonym	Natrix pryeri ishigakiense MALNATE & MUNSTERMAN 1960: 61 Tropidonotus pryeri — WALL 1905 : 515 (part.) Natrix pryeri — STEJNEGER 1907: 284 (part.) Amphiesma pryeri — MALNATE 1960: 51 (part.) Amphiesma pryeri ishigakiense — MALNATE 1962 Amphiesma pryeri ishigakiense — MATSUI 1996 Amphiesma ishigakiense — OTA & IWANAGA 1997: 354 Amphiesma pryeri ishigakiense — GORIS & MAEDA 2004: 208 Hebius ishigakiense — GUO et al. 2014 Amphiesma ishigakiense — WALLACH et al. 2014: 30 Hebius ishigakiensis — TAKEUCHI 2018
Distribution	Japan (Ryukyu Islands) Type locality: Ishigaki-shima, Yaeyama group, Riukiu Islands.
Reproduction	ovoviviparous
Types	Holotype: CAS 21913, male
Diagnosis	Diagnosis: A large species of Amphiesma, SVL 640-730 mm (x̅ = 676 mm) for seven adult males, 603-800 mm (x̅ = 691 mm) for six adult females; VT [ventral scales] 169-178 in males, 164-171 in females; SC 102-109 in males, 93-103 in females; ground colour of head reddish brown in life, brown or brownish grey in preservative; single light V- shaped marking on neck; several light vertical streaks, each of one scale's width or narrower and with black anterior and posterior edges, on each side of anterior 1/ 3 to 1/2 of body; sulcus spermaticus simple, having nude, lip-like border on cylindrical portion of hemipenis and extending only to crotch between apical lobes; W chromosome metacentric, largest microchromosome (autosome pair 7) telocentric; reproductive mode viviparous. (Ota & Iwanaga 1997)
Comment	Raised to species status by Ota & Iwanaga 1997.
Etymology	named after the type locality.
References	Blackburn, Daniel G. 1999. Are Viviparity and Egg-guarding Evolutionarily Labile in Squamates? Herpetologica 55 (4): 556-573 - get paper here Goris, R.C. & Maeda, N. 2004. Guide to the Amphibians and Reptiles of Japan. Krieger, Malabar, 285 pp. 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 Kaito, Takuma; and Mamoru Toda 2016. The biogeographical history of Asian keelback snakes of the genus Hebius (Squamata: Colubridae: Natricinae) in the Ryukyu Archipelago, Japan. Biological Journal of the Linnean Society, DOI: 10.1111/bij.12726 - get paper here Malnate, E.V. 1962. The relationships of five species of the Asiatic natricine snake genus Amphiesma. Proc. Acad. Nat. Sci. Philadelphia, 114, 251–299. - get paper here Malnate, E.V. and MUNSTERMAN,H.E. 1960. Interpopulation variation in the colubrid snake Natrix pryeri from the Riukiu Islands, with description of a new subspecies. Proc. Cal. Acad. Sci. (4) 31 (2): 51-67 - get paper here Ota, HIDETOSHI & SETSUKO IWANAGA 1997. A systematic review of the snakes allied to Amphiesma pryeri (Boulenger) (Squamata: Colubridae) in the Ryukyu Archipelago, Japan. Zoological Journal of the Linnean Society 121 (3): 339-360 - get paper here Takeuchi, H; 2018. Hebius ishigakiensis (Yaeyama Keelback) Diet. Herpetological Review 49 (4): 753 - 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. 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
External links	IUCN Red List National Center for Biotechnology Information http://homepage3.nifty.com/japrep/snake/namihebi/hiba/text/eyaehiba.htm Google images

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