Gehyra montium Storr, 1982

Hutchinson, Mark N., Sistrom, Mark J., Donnellan, Stephen C. & Hutchinson, Rhonda G., 2014, Taxonomic revision of the Australian arid zone lizards Gehyra variegata and G. montium (Squamata, Gekkonidae) with description of three new species, Zootaxa 3814 (2), pp. 221-241: 233-235

publication ID

http://dx.doi.org/10.11646/zootaxa.3814.2.4

publication LSID

lsid:zoobank.org:pub:1F179D1E-6FD6-4E81-946D-A454E7B2DC7E

DOI

http://doi.org/10.5281/zenodo.4919367

persistent identifier

http://treatment.plazi.org/id/AE44F266-FFD6-3408-6C92-FE37FCDA5414

treatment provided by

Felipe

scientific name

Gehyra montium Storr, 1982
status

 

Gehyra montium Storr, 1982  

Figs 3 View FIGURE 3 , 8 View FIGURE 8 .

Gehyra montium Storr, 1982: p. 56   . Holotype: WAM R31732 View Materials , from Mt Lindsay [Watarru], Birksgate Range   GoogleMaps , north-western South Australia (27º 02’S, 129º 53’E).

Specimens scored for morphology (n=29; all genotyped as ‘montium clade’): SAMA: R 44368 View Materials – 69, 14 km ENE Mt Cooparinna   , SA (26º 20’S, 130º 06’E) GoogleMaps   , R 44407 View Materials , 8.4 km NW Mt Kintore   , SA (26º 30’S, 130º 26’E) GoogleMaps   , R 46107 View Materials , 21 km ENE Pipalyatjara   , SA (26º 07’S, 129º 22’E) GoogleMaps   , R 46134 View Materials – 36, 16 km E Pipalyatjara   , SA (26º 10’S, 129º 33’E) GoogleMaps   , R 46139 View Materials , 40 km NE Pipalyatjara   , SA (25º 59’S, 129º 29’E) GoogleMaps   , R 46168 View Materials , 26 km S Pipalyatjara   , SA (26º 24’S, 129º 08’E) GoogleMaps   , R 48718 View Materials , 4 km W Mt Lindsay   , SA (27º 02’S, 129º 50’E) GoogleMaps   , R48731 View Materials –33, Mount Lindsay   , SA (27º 02’S, 129º 53’E) GoogleMaps   , R56451, R56497, 5.6 km W Mount Hoare   , SA (27º 03’S, 129º 39’E) GoogleMaps   , R61922 View Materials –24 K, Morgan Range , WA (25º 53’S, 128º 23’E) GoogleMaps   . WAM: R 90848 View Materials , Woodstock Station , WA (21º 37’S, 119º 01’E) GoogleMaps   , R 90903 View Materials , Woodstock homestead, WA (21º 37’S, 118º 57’E) GoogleMaps   , R 98094 View Materials , Warburton , WA (26º 08’S, 126º 34’E) GoogleMaps   , R 125475, 30km E Newman , WA (23º 19’S, 120º 02’E) GoogleMaps   , R132553, De Grey River Station , WA (20º 16’S, 119º 12’E) GoogleMaps   , R154518, R154523, 156679, Yarri Mining Camp , WA (20º 36’S, 120º 19’E) GoogleMaps   , R156317, Chichester Range , WA (22º 14’S, 118º 58’E GoogleMaps   , R166317, R166321, Morgan Range, WA (25º 53’S, 128º 23’E). GoogleMaps  

Diagnosis. Distinguished from other Australian Gehyra   by a combination of modally seven divided scansors under the expanded portion of the fourth toe, small to moderate size, generally two pairs of enlarged chin shields, second infralabial notched, a dorsal colour pattern combining pinkish brown to rufous colouring (in life) usually patterned by small pale spots interspersed in a continuous network of irregular, dark lines, and a karyotype of 2n=42a (illustrated in King 1979, fig. 9; Moritz 1986, fig. 3). Distinguished from some other rock dwelling species ( G. minuta   , G. moritzi   sp. nov. and G. pulingka   sp. nov.) by more reticulate dorsal pattern and often weak contrast of pale spots. Most similar to G. variegata   and G. versicolor   sp. nov. but somewhat smaller and usually more rufous in colouring with dorsal white markings consisting of small poorly contrasting dots (readily lost in preservative) that are not consistently coordinated with the dark markings.

This diagnosis applies to populations of Gehyra   genetically assignable to the “ montium   clade” of Sistrom et al. (2013).

Description. Adult snout-vent length 36–51 mm (mean = 41.7 mm, n = 29). Length of original tail 41–58 mm (mean = 113% SVL, n = 9).

Nostril bordered by rostral, first supralabial, supranasal and two post nasals, the upper usually markedly larger than the lower. None to three (modally 1) moderate internasal scales separate the supranasals above the rostral. Supralabials 8–11 (mode 8). Infralabials 7–9 (mode 8). Consistently two pairs of chin shields, anterior pair in contact with only the first infralabial. Chin shields separated from the third and succeeding infralabials by the interpolation of a series of enlarged scales (parinfralabials) that margin the ventral edge of the infralabials. Second infralabial notched where this parinfralabial scale row starts. Scansors under pad of fourth toe divided, 7–8 (mode 7). Precloacal pores in males 10–13, (mean = 11.3, n = 16).

The karyotype is 2n=42a, a karyotype that is shared with a number of Gehyra species   , including G. minuta   and some populations that are morphologically distinct from G. montium   ( King 1979, fig. 13a) and currently assigned to G. punctata (Fry, 1914)   in Western Australia.

In life, dorsally light grey-brown to reddish brown to pinkish, the entire dorsal surface patterned by a strong to weak reticulum of blackish grey ( Fig. 8 View FIGURE 8 ). Scattered over the dorsal surface are small circular pale spots, often only contrasting weakly with the dorsal background colour. In preservative any rusty colour tones and pale spots tend to disappear leaving the specimens greyish with a dark reticulum.

Distribution. The western portion of the Australian arid zone, from the north-west of South Australia, and south-east of the Northern Territory, north-west to the Pilbara Region of Western Australia.

Comments. Throughout arid areas of central and northern Australia, rocky outcrops may harbour relatively small Gehyra species   , typically with rufous colouring and a pattern including pale spots. The name G. montium   has often been applied to many such populations, but our study reveals that this species only just extends east of the Western Australian border, to the Tomkinson Ranges and Birksgate Ranges (east to Mt Kintore) in South Australia and is probably restricted in the Northern Territory to the far south-west corner (Uluru and the Petermann Ranges). The fact that the species was not recognised hitherto as extending westward as far as the Pilbara possibly reflects a tacit assumption that G. montium   was a central Australian species, as well as the similarity of colour pattern in preserved G. montium   and G. variegata   . This similarity is such that individuals of the two species will continue to be difficult to separate by morphology alone

In the adjacent rocky ranges of north-west South Australia and the southern and central Northern Territory, G. montium   is replaced by geckos of Clades 2 and 1 ( Sistrom et al. 2013), respectively, and these are described below as new species.

Populations we have assigned to this species require further study in several areas. Colour and pattern as described here is based on central Australian populations for which we had freshly collected material of known genotype; preserved specimens examined by us suggest that this colour pattern extends to Pilbara populations, but in this region the species is more variable in colour pattern. Animals of known genotype from this area include not only animals with a dark dorsal network, but also almost plain individuals, grey in preservative but possibly rusty in life, with no more than scattered small black speckles. Three specimens genotyped as G. montium   by Sistrom et al. (2013) are from areas to the south and west of the species’ main distribution, apparently in areas of sandy desert rather than rocky ranges. Further collection and typing of specimens from these populations is needed to confirm that these seemingly atypical records are correctly documented, and that there are populations of Gehyra   from these areas that pertain to this species.

When describing this species Storr (1982) suggested it might represent the 2n=38 karyotypic group of King (1979). However, the data of Moritz and our own checks of karyotype show that populations conspecific with the type population of montium   have the 2n=42a karyotype.

SAMA

South Australia Museum

R

Departamento de Geologia, Universidad de Chile

SA

Museum national d'Histoire Naturelle, Laboratiore de Paleontologie

WAM

Western Australian Museum

Kingdom

Animalia

Phylum

Chordata

Class

Reptilia

Order

Squamata

Family

Gekkonidae

Genus

Gehyra

Loc

Gehyra montium Storr, 1982

Hutchinson, Mark N., Sistrom, Mark J., Donnellan, Stephen C. & Hutchinson, Rhonda G. 2014
2014
Loc

Gehyra montium

Storr, G. M. 1982: 56
1982