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Higher TaxaViperidae, Viperinae, Colubroidea, Alethinophidia, Serpentes, Squamata (snakes) 
Common Names 
Pelias darevskii — TUNIYEV et al., 2009 (part)
Pelias darevskii — AVCI et al. 2010
Pelias olguni — WALLACH et al. 2014: 544 
DistributionTurkey (Upper Flow of the Kura River)

Type locality: Turkey, Ardahan Province, Town Posof, Mt. Ilgar-Dag, (2020 m elevation).  
TypesHolotype: SNP 866, Herpetological collection of the Sochi National Park, Sochi, SNP 866, adult female, 21 July 2011, collectors B. Tuniyev, S. Tuniyev, A. Avci. Paratypes. Fifteen specimens: herpetological collection of the Sochi National Park, Sochi, 13 specimens; Zoology Department Ege University, Zoology Lab. of the Department of Biology at Buca Education Faculty, Turkey (ZDEU). 
DiagnosisDiagnosis. Small-sized snake, different from a related species Darevsky’s viper by the having smaller sizes of trunk, body, tail, lower number of preventrals, sublabials and wings of zigzag; by the having higher number of scales round a neck and middle of body, supralabials and crown shields. Parietal shields have incision in most of the specimens. Animals from above are painted in gray and russet tones; a zigzag does not consist of numerous transversal prolate spots, only in some part united. Belly from dark spotted to almost black. 
CommentPelias is typically considered as a subgenus, hence we follow this use here. 
EtymologyThe species is named in honor of Prof. Dr. Kurtulus Olgun. 
  • Tuniyev B.S., Tuniyev S.B., Avcı A., Ilgaz Ç. 2014. Herpetological studies in Eastern and North-Eastern Turkey. Current Studies in Herpetology 14 (1/2): 44–53. Резюме - get paper here
  • Tuniyev, B.S.; A. Avcı, Ç. Ilgaz, K. Olgun, T.V. Petrova, S.Yu. Bodrov, P. Geniez and A. Teynié 2018. ON TAXONOMIC STATUS OF SHIELD-HEAD VIPERS FROM TURKISH LESSER CAUCASUS AND EAST ANATOLIA Proceedings of the Zoological Institute RAS 322 (1): 3–44
  • Tuniyev, S. B.; A. Avcı, B. S. Tuniyev, A. L. Agasian, L. A. Agasian 2013. Description of a New Species of Shield-Head Vipers - Pelias olguni sp. nov. from Basin of Upper Flow of the Kura River in Turkey. Russ. J. Herpetol. 19 (4): 314-332 - 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.
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