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Higher TaxaScincidae, Sphenomorphinae (Sphenomorphini), Scincoidea, Sauria, Squamata (lizards)
Common NamesE: Prey Lang Forest Skink 
SynonymSphenomorphus preylangensis GRISMER, WOOD, QUAH, ANUAR, POYARKOV, THY, ORLOV, THAMMACHOTI & SEIHA 2019 
DistributionCambodia (Preah Vihear)

Type locality: Phnom Chi, Prey Lang Wildlife Sanctuary, Preah Vihear Province, Cambodia (11°34.187’ N 104°53.274’ E, at 320 m in elevation  
TypesHolotype. CBC 02348, adult female, was collected by Neang Thy & Hun Seiha on 23 June 2014. Paratypes. CBC 02349 (female) and CBC 02403-06 (juveniles) bear the same collection data as the holotype. 
DiagnosisDiagnosis. Sphenomorphus preylangensis sp. nov. can be separated from all other species of Sphenomorphus by having the unique combination of a maximum adult female SVL of 87.6 mm; head, body, and supracaudal scales smooth; frontal scale not divided; prefrontals not in contact; parietals in contact posterior to interparietal; parietals not divided; six scales bordering the parietals; four nuchals; four supraoculars; two loreals; anterior loreal not divided; loreals in contact with supralabials; no deep postnasal groove; eight or nine superciliaries; superciliary row not interrupted by fourth supraocular; lower eyelid scales large; seven or eight supralabials; seven infralabials; three pairs of chinshields; one primary temporal scale; two secondary temporals; upper secondary temporal large; no subtemporals; 24 midbody scale rows; 61–68 paravertebrals; paravertebrals slightly wider than other dorsals; 63–71 ventrals; two enlarged precloacals; 11–13 scales around tail at level of tenth subcaudal; anterior subcaudals divided; unpaired subcaudals enlarged; 17–19 subdigital lamellae beneath fourth toe; 11–14 subdigital lamellae beneath fourth finger; no wide, dark, vertebral or lateral stripes or blotches; dark blotches on top of head; no dark anterolateral spots on the flanks; dark transverse subcaudal bars on original tail; thin, dark, dorsal caudal bands; and labial margins edged with black. The nine diagnostic meristic and the six color pattern characters are scored across all clade members in Table 6 in GRismer et al. 2019.

Comparisons (Fig. 6; Table 4 in Grismer et al. 2019). Sphenomorphs preylangensis sp. nov. can be distinguished from S. stellatus by having statistically fewer fourth toe (17–19 vs. 20–26) and fourth finger (11–14 vs. 14–18) subdigital lamellae and having large, dark blotches as opposed to small speckles on the top of the head as well as dark transverse dorsal and subcaudal bars/bands and black labial sutures as opposed to their absence. From S. annamiticus it is differentiated by having statistically more paravertebral (61–68 vs. 53–62) and ventral (63–71 vs. 55–65) scales, and lacking as opposed to having wide, dark vertebral and lateral blotches. Sphenomorphus preylangensis sp. nov. is distinguished from S. praesignis by having statistically more infralabial scales (seven vs. six or seven, modally six) and statisti- cally fewer midbody scale rows (24 vs. 27–30); and by the absence of large, dark anterolateral spots. 
EtymologyThe specific epithet preylangensis is a Latinized toponymic adjective named after the Prey Lang Wildlife Sanctuary. 
  • GRISMER, L. LEE; PERRY L. WOOD, JR., EVAN S. H. QUAH, SHAHRUL ANUAR, NIKOLAY A. POYARKOV, NEANG THY, NIKOLAI L. ORLOV, PANUPONG THAMMACHOTI & HUN SEIHA 2019. Integrative taxonomy of the Asian skinks Sphenomorphus stellatus (Boulenger, 1900) and S. praesignis (Boulenger, 1900) with the resurrection of S. annamiticus (Boettger, 1901) and the description of a new species from Cambodia. Zootaxa 4683 (3): 381–411 - get paper here
  • GRISMER, L. LEE; ROMAN A. NAZAROV, VLADIMIR V. BOBROV & NIKOLAY A. POYARKOV 2020. A new species of Sphenomorphus (Squamata: Scincidae) from Phu Quoc Island, Vietnam with a discussion of biogeography and character state evolution in the S. stellatus group. Zootaxa 4801 (3): 461–487 - get paper here
  • Kwet, A. 2020. Liste der im Jahr 2019 neubeschriebenen Reptilien. Elaphe 2020 (3): 44-67
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