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Pareas geminatus DING, CHEN, SUWANNAPOOM, NGUYEN, POYARKOV & VOGEL, 2020

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Higher TaxaPareidae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Twin Slug snake
Chinese: 伯仲钝头蛇 (Bó Zhòng Dùn Tóu Shé) 
SynonymPareas geminatus DING, CHEN, SUWANNAPOOM, NGUYEN, POYARKOV & VOGEL 2020
Pareas hamptoni — VOGEL 2010
Pareas hamptoni — TEYNIÉ & DAVID 2010 [partim]
Pareas geminatus — LIU & RAO 2021
Pareas (Eberhardtia) geminatus — POYARKOV et al. 2022 
DistributionChina (Yunnan), Thailand (Chiang Mai), N Laos

Type locality: Jiangcheng County (21.207556° N, 94.020056°E; alt. 2,280 m elevation), Yunnan Province, China.  
Reproduction 
TypesHolotype. CIB118021, Adult male, collected by Ding Li on 21 May 2006.
Paratypes (n=5). Adult females, CIB118022 and CIB118023, collected from Jiangcheng County (22.603453 N, 101.882167 E; alt. 1,272 m a.s.l.), Yunnan Province, China; adult male, MNHN 0171S, collected from Houaphanh Province, Laos (no exact locality data); subadult male, ZMMU R-16695, collected from Long Tien, Xaisomboun Province, Laos; adult female, QSMI 1013, collected from Tak Province (approx. 16.425833 N, 99.000000 E; alt. 1,160 m a.s.l.), Thailand.
Other specimens: AUP 00176, ZMMU R-16477, ZMMU R-16478 (from Doi Inthanon NP, Chiang Mai Province, Thailand), KIZ 
DiagnosisDiagnosis: Pareas geminatus sp. nov. differs from all congeners by the combination of the following morphological characters: a slender, yellow-brown, medium-sized snake (total length 566 mm); one or two anterior temporals; loreal not contacting the eye; prefrontal contacting the eye; one preocular; slightly enlarged median vertebral row; usually 7 (6–8) supralabials; 8 infralabial scales; 3–5 scale rows slightly keeled at midbody; 170–188 ventrals lacking lateral keels; 75–91 subcaudals, all divided; slightly billowing vertical dark bars on the trunk; two slight thin black postorbital stripes starting from lower and upper edges of postorbital scales; lower postorbital stripe reaching the anterior part of seventh supralabial, not continuing to the lower jaw and chin; the left and right upper postorbital stripes merge forming a black nuchal collar.


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Comment 
EtymologyThe specific epithet “geminatus” is a Latin adjective in nominative singular (masculine gender) derived from the Latin “geminus”, for “twin”, “double”, and is given in reference to the similarity in morphology of the new species to its sister taxon, P. hamptoni, with which it was confused for a long time. 
References
  • Ding, Li; Zening Chen, Chatmongkon Suwannapoom, Tan Van Nguyen, Nikolay A. Poyarkov, & Gernot Vogel 2020. A new species of the Pareas hamptoni complex (Squamata: Serpentes: Pareidae) from the Golden Triangle. TAPROBANICA 9 (2): 174–193
  • Liu S, Rao D 2021. A new species of the genus Pareas (Squamata, Pareidae) from Yunnan, China. ZooKeys 1011: 121-138 - get paper here
  • Liu, S.; Mo, M.; Li, M.; Li, B.; Luo, X.; Rao, D.; Li, S. 2024. Description of a New Species of the Pareas hamptoni Complex from Yunnan, China, with Confirmation of P. hamptoni Sensu Stricto in China (Squamata, Pareidae). Animals 2024, 14, 421 - get paper here
  • Poyarkov NA, Nguyen TV, Pawangkhanant P, Yushchenko PV, Brakels P, Nguyen LH, Nguyen HN, Suwannapoom C, Orlov N, Vogel G. 2022. An integrative taxonomic revision of slug-eating snakes (Squamata: Pareidae: Pareineae) reveals unprecedented diversity in Indochina. PeerJ 10: e12713 - get paper here
  • Teynié, A. & David, P. 2010. Voyages Naturalistes au Laos: Les Reptiles. Éditions Revoir, Nohanent, 315 pp
  • Vogel, Gernot 2010. ON THE DISTRIBUTION OF Pareas hamptoni (BOULENGER, 1905) IN THAILAND (SERPENTES: PAREATINAE). Russ. J. Herpetol. 17 (3): 219 – 222 - get paper here
  • 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
 
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