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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Common NamesE: Crescent-marked Pilbara Gehyra 
SynonymGehyra unguiculata KEALLEY, DOUGHTY, PEPPER, KEOGH, HILLYER & HUEY 2018
Gehyra variegata C1 — ASHMAN et al. 2018 
DistributionAustralia (Western Australia: only known from two locations 30 km apart in the north-eastern Pilbara near Shay Gap, north of the De Grey River)

Type locality: 47.5 km east–south-east of Goldsworthy, site PHYC03 of the Pilbara Biodiversity Survey (2025′41′′S, 11958′10′′E), WA.  
TypesHolotype: WAM R161461, an adult male collected on 1 October 2005 by A.H. Burbidge and C. Stevenson. Paratypes. WAM R108368 (male), Sunrise Hill (2027′39′′S, 12002′54′′E); WAM R108420 (male), Nimingarra (2026′11′′S, 12000′39′′E); WAM R156584 (male), Cundaline Gap (2033′28′′S, 12010′55′′E); WAM R161459 and WAM R161460 (females), as for holotype. 
DiagnosisDiagnosis. A small-bodied (to 39.0 mm SVL) species with moderately short snout, internarial present (67%) or absent (33%), lower postnasal larger or equal to upper, two pairs of chin shields, second infralabial notched by parinfralabial scales, usually six (occasionally seven) subdigital lamellae on the fourth toe and males with 11–13 (mean 12.3) pre-cloacal pores. In preservative, background colour light tan to medium brown with crescent-shaped dark brown bars with pale spots posteriorly, crown with pale white spots, usually poorly defined head stripes and ventrum with only light stippling towards lateral edges. Genetically diagnosed from other arid clade members by the ND2 sites presented in Table 3.

Colour and pattern. No known photos in life

Comparisons with other species. This small-bodied species possesses a highly distinctive dorsal pattern of crescent-shaped dark and pale markings and ventrum with light stippling on edges but with central area immaculate. From other co-occurring species it differs from G. pilbara by possessing a snout of moderate length (vs very short) and brownish dorsal colouration (vs reddish-orange). From G. purpurascens it differs by much smaller body size (maximum 39 vs 67 mm), fewer fourth toe lamellae (6 vs 7–8), more numerous pre-cloacal pores (11–13 vs 8–11) and the unique dorsal markings. From the slightly larger species G. montium and G. incognita sp. nov. it differs by the dorsal pattern and from G. montium by having two (vs 2 or 3) chin shields. 
CommentSimilar species: The patterning tends to overlap that of G. punctata, but the greyish background colouration of G. unguiculata sp. nov. is different than the reddish hues in G. punctata, possibly as an adaptation to the greyer colour of granite outcrops in the northern Pilbara vs the reddish ironstones that are more common elsewhere in the Pilbara.

Distribution: see map in Kealley et al. 2018: 4 (Fig. 1). 
EtymologyUnguiculata is Latin (diminutive) for fingernail (or claw) and refers to the resemblance of the dorsal pattern elements of this species to small fingernails. Used as an adjective. 
  • Ashman, L. G., Bragg, J. G., Doughty, P. , Hutchinson, M. N., Bank, S. , Matzke, N. J., Oliver, P. and Moritz, C. 2018. Diversification across biomes in a continental lizard radiation. Evolution, doi:10.1111/evo.13541 - get paper here
  • Ellis, Ryan J.; Paul Doughty and Aaron M. Bauer 2018. An annotated type catalogue of the geckos and pygopods (Squamata: Gekkota: Carphodactylidae, Diplodactylidae, Gekkonidae, Pygopodidae) in the collection of the Western Australian Museum. Records of the Western Australian Museum 33: 051–094 - get paper here
  • Kealley, Luke; Paul Doughty, Mitzy Pepper, J. Scott Keogh, Mia Hillyer and Joel Huey 2018. Conspicuously concealed: revision of the arid clade of the Gehyra variegata (Gekkonidae) group in Western Australia using an integrative molecular and morphological approach, with the description of five cryptic species. PeerJ 6:e5334; DOI 10.7717/peerj.5334 - get paper here
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