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Opisthotropis voquyi ZIEGLER, DAVID, ZIEGLER, PHAM, NGUYEN & LE, 2018

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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Subspecies 
Common NamesE: Vo Quy’s Mountain Stream Keelback
Vietnamese: Rắn trán võ quý 
SynonymOpisthotropis voquyi ZIEGLER, DAVID, ZIEGLER, PHAM, NGUYEN & LE 2018 
DistributionVietnam (Bac Giang Province)

Type locality: Tay Yen Tu Nature Reserve, Bac Giang Province, 437 m elevation, Vietnam  
Reproduction 
TypesHolotype: IEBR 4326 (Field No. TYT.2013.4), an adult male, collected by Cuong The Pham et al. on 14 June 2013 (Figs. 6–8).
Paratypes. VNMN 06315 [Field No. TYT 2013.1], male, collected by Cuong The Pham et al. in June 2013;
VNMN 06316 [Field No. BG 2015.13], female, collected by Cuong The Pham et al. on 17 May 2015; IEBR 4327
[Field No. BG 2015.33], female, collected by Cuong The Pham et al. on 22 May 2015; IEBR 4328 [Field No. BG
2015.34], female, collected by Cuong The Pham et al. on 22 May 2015; ZFMK 100819 [Field No. BG 2015.35],
female, collected by Cuong The Pham et al. on 22 May 2015; ZFMK 100820 [Field No. TYT 2014.11], female,
collected by Hang An Thi in May 2014, all paratypes same locality data as the holotype (Figs. 8–10). 
DiagnosisDiagnosis. A species of the genus Opisthotropis, characterized by a combination of the following characters: (1) internasal not in contact with loreal; (2) one preocular; (3) usually two postoculars; (4) one anterior temporal; (5) one posterior temporal; (6) 7 or 8, rarely 9 supralabials; (7) 25 maxillary teeth; (8) subcaudals 74–86; (9) 15 dorsal scale rows at neck, at midbody and before vent; (10) body scales smooth or only with few faint keels; (11) dorsal scales being grey, greyish-brown or brown in preservative, posteriorly more or less edged with pale greyishbrown.

Comparisons. The comparison of Opisthotropis voquyi sp. nov. with other species of the genus Opisthotropis and the genera Parahelicops and Paratapinophis was based on the following references: Stuart & Chuaynkern (2007), David et al. (2011), Teynié et al. (2013), Nguyen et al. (in press), and Wang et al. (2017). There are only few species of Opisthotropis and other genera with 15 midbody dorsal scale rows (see Table 4). A NEW SIBLING SPECIES OF OPISTHOTROPIS JACOBI Zootaxa 4374 (4) © 2018 Magnolia Press · 489 Main additional differences between Opisthotropis voquyi sp. nov. and Parahelicops annamensis are: one preocular in the new species versus two in P. annamensis; internasal not in contact with loreal in the new species versus in contact in P. annamensis; body scales smooth or only with few faint keels in the new species versus keeled throughout in P. annamensis and especially strongly keeled on the posterior part of the body and the base of the tail; body dorsum grey to greyish-brown or brown, with dorsals posteriorly more or less edged with pale greyish-brown in the new species versus dorsum with orange bars and spots in P. annamensis. Opisthotropis voquyi sp. nov. differs from O. guangxiensis by 7–9 versus 9–10 supralabials, one posterior temporal (versus two), 74–86 versus 51–58 subcaudals, dorsal scales arranged in 15–15–15 versus 17–15–15 rows, and a greyish to greyish–brown or brown dorsum, dorsal scales posteriorly more or less edged with pale greyishbrown in the new species versus dark body with pale crossbars in O. guangxiensis. Opisthotropis voquyi sp. nov. differs from O. kikuzatoi by 7–9 supralabials (versus 6), one preocular (versus two), one anterior temporal (versus two), and the greyish to greyish-brown or brown dorsal pattern, with the dorsals posteriorly being more or less edged with pale greyish-brown in the new species (versus dark dorsum with dorsolateral orange spots). Opisthotropis voquyi sp. nov. differs from O. maculosa by a grey to greyish-brown or brown dorsum, with dorsals being posteriorly more or less edged with pale greyish-brown in the new species versus with yellow dots on a dark background in O. maculosa. In external morphological characters, O. voquyi sp. nov. is particularly similar to O. jacobi, from which it differs in usually having two postoculars versus only one in O. jacobi, in the number of maxillary teeth: 25 in the new species versus 19–23 in O. jacobi, and in the dorsal scales being grey to greyish–brown or brown versus blackish–brown in O. jacobi. 
CommentSympatry: Cyclophiops multicinctus, Opisthotropis lateralis, Sinonatrix percarinata, Gekko palmatus, Sphenomorphus cryptotis, and Shinisaurus crocodilurus vietnamensis 
EtymologyThe specific epithet is a noun in the genitive case. This species is named in honour of Professor Doctor Vo Quy of Vietnam National University, Hanoi, who passed away on 10 January 2017, and who played a pioneering role in nature conservation in Vietnam. He inspired later generations of conservation biologists, including authors of this study. 
References
  • ZIEGLER, THOMAS; PATRICK DAVID, TIM N. ZIEGLER, CUONG T. PHAM, TRUONG Q. NGUYEN, MINH D. LE 2018. Morphological and molecular review of Jacob’s Mountain Stream Keelback Opisthotropis jacobi Angel & Bourret, 1933 (Squamata: Natricidae) with description of a sibling species from northern Vietnam. Zootaxa 4374 (4): 476-496
 
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