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Pachydactylus robertsi FITZSIMONS, 1938

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos) 
Subspecies 
Common NamesE: Large-scaled gecko, Shielded Thicktoed Gecko
G: Rauhschuppen-Dickfingergecko 
SynonymPachydactylus robertsi FITZSIMONS 1938: 177
Pachydactylus scutatus robertsi — LOVERIDGE 1944: 3
Pachydactylus scutatus robertsi — LOVERIDGE 1947: 358
Pachydactylus scutatus robertsi — WERMUTH 1965: 122
Pachydactylus robertsi — BAUER et al. 2002
Pachydactylus robertsi — BAUER & LAMB 2005
Pachydactylus robertsi — BAUER et al. 2006
Pachydactylus aff. robertsi — RÖSLER 2015: 16 
DistributionNamibia (Keetmanshoop and Karasburg District)

Type locality: Kraigluft Farm, Great Karras Mountains, Southwest Africa. Map legend:
TDWG region - Region according to the TDWG standard, not a precise distribution map.

NOTE: TDWG regions are generated automatically from the text in the distribution field and not in every cases it works well. We are working on it.
 
Reproductionoviparous 
TypesHolotype: TM 17854 
CommentDIAGNOSIS. To 42.0 mm (TM 17854). Pachydactylus robertsi may be distinguished from all other members of the P. serval/weberi group by the combination of the following characters: rostral excluded from nostril; supranasals in broad contact; scales on snout flattened to weakly conical, much larger than those of interorbital and parietal regions, which consist of relatively small tubercles interspersed among granular scales; dorsal scalation heterogeneous, with approximately 22 rows of large, rounded, flattened, weakly imbricate tubercles bearing very prominent central keels; thighs bearing enlarged keeled or conical tubercles; toes relatively short, toe pads narrow; typically 5 undivided lamellae beneath digit IVof pes; tail to at least 114% of SVL, moderately annulate, bearing whorls of keeled tubercles, well-separated from one another; adult pattern with a dark-edged white nape band approximately 2–3 scale rows in width; remainder of dorsum uniform buff to pale brown with small dark flecks relatively uniformly distributed; supralabials white, bordered above by a thick dark brown line passing through orbit (Figs. 62–65); juvenile pattern unknown, probably similar to adult. Pachydactylus robertsimay be distinguished from the unrelated P. scutatus, with which it has been confused, on the basis of the exclusion of the rostral from the nostril and its wider nuchal band (typically 2–3 scale rows vs 1 scale row) (BAUER et al. 2006).

CONSERVATION STATUS. Pachydactylus robertsi is known from only a single quarter degree square in the Karasberg Mountains. Although no immediate threats to the species are evident, its restricted range make it vulnerable to habitat degradation (BAUER et al. 2006).

Distribution: see map in BRANCH et al. 2011. 
References
  • Barts, M. 2003. Pachydactylus scutatus HEWITT. Sauria 25 (4): 2 - get paper here
  • Bauer, A.M. & Lamb, T. 2005. Phylogenetic relationships of southern African geckos in the Pachydactylus group (Squamata: Gekkonidae). African Journal of Herpetology 54 (2): 105-129 - get paper here
  • Bauer, Aaron M. Lamb, Trip. Branch, William R. 2006. A revision of the Pachydactylus serval and P. weberi groups (Reptilia: Gekkota: Gekkonidae) of Southern Africa, with the description of eight new species. Proc. Cal. Acad. Sci. 57 (12-24):595-709.
  • Bauer, Aaron M., Trip Lamb, and William R. Branch 2002. A revision of Pachydactylus scutatus (Reptilia: Squamata: Gekkonidae) with the description of a new species from northern Namibia. Proc. Cal. Acad. Sci. 53 (3): 23-36 - get paper here
  • Bauer, Aaron M.; Branch, William R. & Haacke, Wulf D. 1993. The herpetofauna of the Kamanjab area and adjacent Damaraland, Namibia. Madoqua (Windhoek) 18 (2): 117-145.
  • Boone, J. & Barts, M. 2006. Die Dickfingergeckos des südlichen Afrikas. Teil VI: Freilandbeobachtungen und Terrariennachzucht des Rauhschuppen-Dickfingergeckos Pachydactylus scutatus HWEITT 1927. Sauria 28 (2): 47-53 - get paper here
  • Branch, William R.; Aaron M. Bauer, Todd R. Jackman, and Matthew Heinicke 2011. A New Species of the Pachydactylus weberi Complex (Reptilia: Squamata: Gekkonidae) from the Namibrand Reserve, Southern Namibia. Breviora (524): 1-15. - get paper here
  • Fitzsimons,V.F.M. 1938. Transvaal Museum Expedition to South-West Africa and Little Namaqualand, May to August 1937 - Reptiles and Amphibians. Ann. Transvaal Mus. (Pretoria) 19 (2): 153-209 - get paper here
  • Herrmann, H.-W.; W.R. Branch 2013. Fifty years of herpetological research in the Namib Desert and Namibia with an updated and annotated species checklist. Journal of Arid Environments 93: 94–115 - get paper here
  • Loveridge, A. 1944. New geckos of the genera Afroedura, new genus, and Pachydactylus from Angola. American Museum Novitates 1254: 1-4 - get paper here
  • Loveridge,A. 1947. Revision of the African lizards of the family Gekkondiae. Bull. Mus. Comp. Zool. Harvard 98: 1-469 - get paper here
  • Rösler, H. 2000. Kommentierte Liste der rezent, subrezent und fossil bekannten Geckotaxa (Reptilia: Gekkonomorpha). Gekkota 2: 28-153
  • Rösler, Herbert 2015. Bemerkungen über einige Geckos der Zoologischen Staatssammlung München. Gekkota, Suppl. (2): 3-54
 
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