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Common NamesSadan sin cave bent-toed gecko 
SynonymCyrtodactylus sadansinensis GRISMER, WOOD JR, THURA, ZIN, QUAH, MURDOCH, GRISMER, LIN, KYAW & LWIN 2017: 45 
DistributionMyanmar (Mon State)

Type locality: Sadan Sin Cave 10.5 km north-west of Mawlamyine, Mawlamyine District, Mon State, Myanmar (N16°31.729, E97°43.056; 26 m in elevation).  
TypesHolotype: LSUHC 12857, Adult male collected on 6 October 2016 at 1600 h by Evan S. H. Quah, Perry L. Wood, Jr., Matthew L. Murdoch, Thaw Zin, Myint Kyaw Thura, Htet Kyaw and L. Lee Grismer. Paratypes: Adult females BYU 52220, 12858–59 and juvenile male LSUHC 12856 bear the same collection data as the holotype. 
DiagnosisDiagnosis: Cyrtodactylussadansinensissp.nov.differs from all congeners by having the unique combination of 8–10 supralabials; seven or eight infralabials; 25–28 paravertebral tubercles; 9–11 longitudinal rows of body tubercles; 31–34 ventral scales; relatively long digits with eight or nine expanded subdigital lamellae on the fourth toe proximal to the digital inflection, 14–16 unmodified distal subdigital lamellae, 22–24 total subdigital lamellae; low and rounded, weakly keeled, dorsal, body tubercles not extending onto tail; enlarged femoral and precloacal scales not continuous; 19–23 enlarged femoral scales; 20 or 21 femoral pores in males; 12–15 enlarged precloacal scales; 12–14 precloacal pores in males; three rows of enlarged post- precloacal scales; subcaudal scales three times as wide as long, extending onto sides of tail; top of head bearing a dark mottled pattern, no yellow reticulum; nuchal loop not divided medially, lacking an azygous notch, and usually having a sinuous posterior border; five dark, regularly shaped, dorsal bands never wider than interspaces, bearing lightened centres, not edged with white tubercles; first dorsal band lacking azygous notch; dark markings in dorsal interspaces; ventrolateral fold not whitish; anterodorsal margin of thighs and brachia pigmented; 9–11 light caudal bands bearing dark markings, not encircling tail; 8–10 dark caudal bands never wider than light caudal bands; and regenerated tails immaculate, uniform brown.

Comparisons: Cyrtodactylus sadansinensis sp. nov. is part of the sadansinensis group that includes C. sadansinensis and the sister species C. pharbaungensis sp. nov. and C. sanpelensis sp. nov. (Fig. 9). The PCA and DAPC analyses indicate that the species of this group are completely separate in morphospace (Fig. 12) where the first two principal components account for 59% of the total variation and load most heavily for longitudinal rows of tubercles, enlarged precloacal scales, and number of unmodified and total number of fourth toe subdigital lamellae (Table S2). These species are even further separated in the DAPC analysis where only the first four components are retained (Fig. S5). Additionally, all three species have statistically significant different mean values for their number of paravertebral tubercles, longitudinal rows of dorsal body tubercles, enlarged femoral scales, enlarged precloacal scales, unmodified subdigital lamellae on the fourth toe, post-precloacal scales rows and precloacal pores, and not lacking pigment in the anterodorsal margins of the thighs and brachia (Table 5). It differs further from C. pharbaungensis by not having continuous, enlarged femoral and precolacal scales (Table 8). Varying combinations of other differences between C. pharbaungensis sp. nov. and C. sanpelensis sp. nov. as well as the other newly described species in the Indo-Chinese clade are presented in Table 8. Genetic distances among the species of this group range from 8.7 to 13.1% (Table 10). 
EtymologyThe specific epithet, sadansinensis, is a noun in apposition in reference to the type locality of Sadan Sin Cave. 
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