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Gekko nadenensis LUU, NGUYEN, LE, BONKOWSKI & ZIEGLER, 2017

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos) 
Subspecies 
Common NamesE: Naden Gecko
Laotian: Kap Ke Naden
G: Naden Gecko 
SynonymGekko nadenensis LUU, NGUYEN, LE, BONKOWSKI & ZIEGLER 2017 
DistributionC Laos (Khammouane Province)

Type locality: on a karst cliff, near the entrance of Nang Log cave (17°30’N, 105°23’E, elevation 178 m a.s.l.), Naden Village, Gnommalath District, Khammouane Province, central Laos  
Reproduction 
TypesHolotype: VNUF R.2016.1, adult male, collected by Vinh Quang Luu and Kieusomphone Thanabuaosy on 20 February 2016.
Paratype. NUOL-R.2016.2, adult male, the same data as the holotype; ZFMK 98741, gravid adult female, collected on a karst cliff inside Nang Log cave by Vinh Quang Luu, Thomas Calame, and Kieusomphone Thanabuaosy on 29 March 2015. 
DiagnosisDiagnosis. Gekko nadenensis sp. nov. differs from its relatives by a combination of the following characters: a medium-sized gecko species (SVL 61.0–77.1 mm); nares bordered with rostral; internasals absent; postmentals enlarged; interorbital scales between anterior corners of the eyes 28–30; dorsal tubercles absent; ventral scales between mental and cloacal slit 175–185; midbody scale rows 123–140; ventral scale rows 38–40; subdigital lamellae on first toes 13–15, on fourth toes 14–16; finger and toe webbing present at base; tubercles on upper surface of fore and hind limbs absent; precloacal pores six (3+3 or 5+1) in a discontinuous row in males and absent in the female; postcloacal tubercles 1 or 2; tubercles absent on dorsal surface of tail base; subcaudals distinctly enlarged; dorsal surface of body with greyish brown blotches.

Comparisons. Based on examination of specimens and data obtained from the literature (Boulenger 1907; Ota et al. 1995; Rösler et al. 2005, 2010, 2011; Yang et al. 2012, Nguyen et al. 2013; Luu et al. 2014; Ngo et al. 2015; Yang 2015; Luu et al. 2015) we compared the new species from Laos with the remaining members of the Gekko japonicus group (Rösler et al. 2011; Luu et al. 2015) (see Table 3).
Morphologically, the new Gekko species can be distinguished from the species of the G. japonicus group (following Rösler et al. 2011; Luu et al. 2015) as follows:
Gekko nadenensis sp. nov. does not have dorsal tubercles and thus differs from the following species which have tubercles on the back: G. adleri, G. auriverrucosus, G. canhi, G. chinensis, G. japonicus, G. hokouensis, G. kwangsiensis, G. liboensis, G. palmatus, G. scabridus, G. shibatai, G. similignum, G. swinhonis, G. vertebralis, and G. wenxianensis.
The new species can be distinguished from G. aaronbaueri by having fewer interobital scales (28–30 versus 34–37), more scale rows around midbody (123–140 versus 98–104), and more precloacal pores in males (6 versus 3–4); from G. melli by its smaller size (SVL reaching 77.1 mm versus 84.6 mm), fewer interorbitals (28–30 versus 34–40), internasals absent (versus present), postmentals enlarged (versus not enlarged), and fewer precloacal pores in males (6 versus 9–11); from G. subpalmatus by having fewer interorbitals (28–30 versus 32), postmentals enlarged (versus not enlarged), the absence of internasals (versus present), having fewer ventral scales (38–40 versus 48), and precloacal pores in a discontinuous row in males (versus in a continuous row); from G. taibaiensis by its larger size (SVL reaching 77.1 mm versus 69 mm), having more supralabials (12–14 versus 9–10), and more lamellae under first and fourth toes (13–15 versus 6−7 and 14–16 versus 7 or 8, respectively); from G. tawaensis by the lack of internasals (versus 2), having postmentals enlarged (versus not enlarged in G. tawaensis), and precloacal pores present (versus absent); from G. truongi by its smaller size (SVL reaching 77.1 mm versus 95.9 mm), having fewer interobital scales (28–30 versus 45–48), more scales from mental to cloacal slit (175–185 versus 160–172), and fewer precloacal pores in males (6 versus 10–11); and from G. yakuensis by lacking internasals (versus having), having postmentals enlarged (versus not enlarged), fewer precloacal pores in males (6, in a discontinuous row versus 6–8, in a continuous row), and the absence of tubercles on dorsal surface of tail (versus presence).
Gekko nadenensis sp. nov. is similar to G. bonkowskii, G. thakhekensis, G. scientiadventura, and G. sengchanthavongi in body size and dorsal pattern. However, the new species can be distinguished from G. bonkowskii by having more interorbitals (28–30 versus 26–27), precloacal pores in a discontinuous row in males (versus in a continuous row), more scales from mental to cloacal slit (175–185 versus 154–169), and more scale rows at midbody (123–140 versus 117); from G. thakhekensis by having more interorbitals (28–30 versus 22–26), more precloacal pores in males (6, in a discontinuous row versus 1–5, in a continuous row), more scales from mental to cloacal slit (175–185 versus 165–174), and more scale rows at midbody (123–140 versus 110–116); from G. scientiadventura by having fewer interorbitals (28–30 versus 41–51), and precloacal pores in a discontinuous row in males (versus in a continuous row), and more scales from mental to cloacal slit (175–185 versus 118–140); from G. sengchanthavongi by having more precloacal pores in males (6 versus 4–5), more supralabials and infralabials (12–14 versus 8−10 and 10–12 versus 6–7, respectively), dorsal head pattern with light grey blotches and a grey stripe behind the orbit (versus dark and grey spots), and dorsal body pattern with light grey blotches and brown flecks (versus irregular transverse dark brown bars). For more details see Table 4 (in Luu et al. 2017). 
CommentSimilar species: Molecular analyses demonstrated the new species is closely related to G. bonkowskii and G. thakhekensis, but separated from them by approximately 7% in genetic divergence as shown by a fragment of the mitochondrial ND2 gene

Abundance: only known from its original description (Meiri et al. 2017). 
EtymologyNamed after its type locality, Naden Village 
References
  • LUU, VINH QUANG; TRUONG QUANG NGUYEN, MINH DUC LE, MICHAEL BONKOWSKI, THOMAS ZIEGLER 2017. A new karst dwelling species of the Gekko japonicus group (Squamata: Gekkonidae) from central Laos Zootaxa 4263 (1): 179-193 - get paper here
  • Meiri, Shai; Aaron M. Bauer, Allen Allison, Fernando Castro-Herrera, Laurent Chirio, Guarino Colli, Indraneil Das, Tiffany M. Doan, Frank Glaw, Lee L. Grismer, Marinus Hoogmoed, Fred Kraus, Matthew LeBreton, Danny Meirte, Zoltán T. Nagy, Cristiano d 2017. Extinct, obscure or imaginary: the lizard species with the smallest ranges. Diversity and Distributions - get paper here
 
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