Gehyra paranana, Doughty & Bourke & Tedeschi & Pratt & Oliver & Palmer & Moritz, 2018

Doughty, Paul, Bourke, Gayleen, Tedeschi, Leonardo G., Pratt, Renae C., Oliver, Paul M., Palmer, Russell A. & Moritz, Craig, 2018, Species delimitation in the Gehyra nana (Squamata: Gekkonidae) complex: cryptic and divergent morphological evolution in the Australian Monsoonal Tropics, with the description of four new species, Zootaxa 4403 (2), pp. 201-244: 215-217

publication ID

https://doi.org/10.11646/zootaxa.4403.2.1

publication LSID

lsid:zoobank.org:pub:2EE3EE9D-A1BB-4628-BB76-0D4A17C52BEF

persistent identifier

http://treatment.plazi.org/id/98698781-FFA0-FFE9-4EF5-EBA5ACA5F913

treatment provided by

Plazi

scientific name

Gehyra paranana
status

sp. nov.

Gehyra paranana   sp. nov. Bourke, Doughty, Tedeschi, Oliver & Moritz

Litchfield spotted gecko

(lineage nana   3)

Figs. 5 View FIGURE 5 , 8 View FIGURE 8 , 9 View FIGURE 9

Holotype. NTM R37057 View Materials , an adult female collected from Dorat Road, Robin Falls area , Northern Territory (13.35278°S; 131.13361°E), on 21 September 2013 by P.M. Oliver, P. Skipwith and M. Hammer. GoogleMaps  

Paratypes (12). Northern Territory: NTM R20246 View Materials (male), Butterfly Gorge, 6 km east of Daly River crossing (13.73333°S; 130.73333°E) GoogleMaps   ; NTM R37831 View Materials (field# CCM0651 View Materials ) and NTM R37832 View Materials ( CCM0652 View Materials ) (females), Bullo River Station (15.65862°S; 129.65944°E) GoogleMaps   ; NTM R36578 View Materials and NTM R36579 View Materials (females), Bullo River Station (15.65766°S; 129.65933°E) GoogleMaps   ; NTM R36554 View Materials (male), Gurrandalng camp, Keep River National Park (15.87516°S; 129.051°E) GoogleMaps   ; NTM R37056 View Materials (male), Dorat Road, Robin Falls area (13.35278°S; 131.13361°E) GoogleMaps   ; NTM R37833 (CCM2881) (female), NTM R37834 View Materials ( CCM2883 View Materials ) and NTM R37835 View Materials ( CCM2885 View Materials ) (males), Tolmer Falls turnoff, Litchfield National Park (13.19654°S; 130.71394°E) GoogleMaps   ; NTM R37836 View Materials ( CCM2936 View Materials ) (female) and WAM R177563 ( CCM2937 View Materials ) (female), Florence Falls turnoff, Litchfield National Park (13.12641°S; 130.80463°E) GoogleMaps   .

Diagnosis. A Gehyra   with moderately small body size (~ 50 mm, range 40–57 SVL), no flap of skin between limbs, dorsal half of rostral deeply furrowed with groove, single internasal usually present, 2 postnasals usually similar in size but if different then upper larger than lower, first supralabial slightly taller and narrower than second, 2 pairs of chin shields, first digit of manus and pes without claw, moderately flattened snout, snout straight to concave in lateral view, 7 divided subdigital lamellae on fourth toe, in adult males an average of 15 pre-cloacal pores (range 12–19) arranged in chevron pointing anteriorly. In life, moderately dark tan to brown background colour with pale and dark moderately large spots of similar size and not in contact on dorsum that tend to form transverse rows or coalescing to form short bars.

Description. Body size moderately small (mean 49.7 mm, range 39.7–56.7 mm SVL; trunk length moderate (TrunkL/SVL 0.40, 0.36–0.44), body shape moderately robust and dorsoventrally flattened, moderately flattened head (HD/HL 0.42, 0.38–0.44) and snout, with short snout (SnEye/HL 0.44, 0.42–0.46), straight to slightly concave in lateral view, depression between rounded canthal ridges; neck moderately constricted. Limbs moderate length (ArmL/SVL 0.10, 0.08–0.12; LegL/SVL 0.11, 0.09–0.13); digits short; claw protruding from dorsal surface of expanded circular to oblong terminal toepad, no claws on anteriormost digit of manus and pes; 7 pairs of subdigitial lamellae on fourth toe (one individual with 6); 1–3 granular scales between proximate one or two rows of lamellae in 3 of 13 specimens examined.

Nostrils rounded, directed laterally and slightly dorsally, contacted by rostral, supranasal, two postnasals of similar size but upper occasionally larger than lower, and first supralabial; supralabials and infralabials 7–9; rostral width ~1.7 x height with a deep furrow ~50% of rostral height, a fine medial groove extends 40–70% of the height of the scale from dorsal edge, surface of rostral with dimpled appearance; supranasals rectangular to round, dorsal edge straight or curved, ventral edge flat and in contact with rostral, supranasals typically separated medially by single small internarial scale (sometimes 2) along dorsal edge of rostral, postnasals of similar size, but upper occasionally larger than lower, first supralabial taller and narrower than second; mental narrow, angling inwards posterior to infralabials, terminating in triangular point, from 1/5 to 1/3 height of inner chin shields; outer chin shields smaller than inner (~1/2 length), with rounded lateral-posterior edges, smaller irregular-sized granular scales lateral to posterior half of outer chin shields; inner chin shields usually in contact or narrowly excluded to second infralabial; first scale of parainfralabial row of scales usually forming a notch on postero-ventral edge of second or third infralabial (if the latter, some granular scales frequently extend to contact second infralabial); chin scale arrangements frequently asymmetric.

Scales on dorsum small, non-overlapping; scales near eyes becoming larger, scales on snout large and rounded; slightly enlarged row of scales above supralabials; scales on ventrum flat and ~6– 8 x larger than those on dorsum, becoming granular anterior to arms; granular scales on gular region, increasing in size towards parainfralabial row and infralabials; scales on ventral surface of thighs and anterior to cloaca enlarged and flat; medial row of scales on tail greatly enlarged and much wider than long, bordered laterally by 1–2 rows of moderately enlarged scales, scales on dorsal and lateral surfaces of tail slightly enlarged and tending to be arranged in regular rows; regenerated tails with same scalation, but formed by more irregular scales.

Males (n = 6) with an average of 15 (from 12–19) pre-cloacal pores forming a shallow chevron with the apex pointed anteriorly, pores penetrating scale, apex pore is generally present; 2 enlarged protruding cloacal spurs to either side of cloaca (females with only slightly enlarged analogous scales). Tail cylindrical and long, tapering to fine point.

Colouration. In life, background colour of dorsal surfaces dark tan to medium-brown with reddish hues; widely scattered brownish-black dark bars or spots and pale white spots of similar diameter or thickness not in contact and often (but not always) tending to form alternating transverse rows; dark spots usually forming irregularly-shaped bars, but some individuals with roundish spots; midline somewhat lightened in many individuals; dark temporal streak posterior to eye usually present; large dark spots almost extend to eye level on crown but small pale spots or fine stippling extending to snout; supralabials light to heavily stippled with dark pigment, often with maculated appearance formed by hiatus of pigment near sutures; infralabials, mental, chin shields and scales on outer edge of jaw with dark stippling, infralabials often with maculated appearance as for supralabials; upper surfaces of limbs with small pale spots, small dark spots variably expressed, continuing to dorsal surfaces of digits; ventrum pale off-white with light stippling in centre and denser towards lateral edges; dorsal and lateral surfaces of original tails with alternating pale and dark rows of spots; regenerated tails with an admixture of dark and pale scales, some forming longitudinal streaks; ventral surface of tail as for ventrum. In preservative, any reddish hues are lost and background colour is a medium brown.

Habitat. This species has been collected from sandstone rock formations in open woodland habitats, appearing to prefer large expanses of exposed sandstone such as large boulders and rock walls. It is sympatric with G. nana   and G. koira   ( australis   group) at northern localities. The former is a smaller-bodied species that is more commonly found on smaller boulders and amongst rock rubble, whereas G. koira   is much larger and prefers boulders and vertical crevices.

Distribution. Gehyra paranana   sp. nov. occurs in the north-western Northern Territory ( Fig. 1 View FIGURE 1 ). In the east it is abundant in Litchfield National Park, approximately 100 km south of Darwin, south to Butterfly Gorge on the Douglas River. Westernmost records are from the vicinity of Bullo Station near the border of Northern Territory and Western Australia. Recently genotyped specimens from Bradshaw Field Training Area also confirm its presence in the intervening Wingate Range (unpublished data).

Etymology. The specific name paranana   refers to the morphological similarity of this species to G. nana   , as in “parallel to nana   ”.

Comparisons with other species. Gehyra paranana   sp. nov. resembles G. nana   closely, and the same comparisons to distinguish G. nana   from other Gehyra   above can largely be apply to G. paranana   sp. nov. With respect to G. nana   , all but one specimen of G. paranana   sp. nov. possessed 7 subdigital lamellae on the fourth toe, whereas G. nana   usually had 5 or 6. For body size, most G. paranana   sp. nov. have SVL> 50 mm (maximum SVL is 56.7 mm), whereas most G. nana   have SVL <50 mm; however, some G. nana   from the western Top End (Mt Bundy, Edith Falls, Hayes Creek) do attain larger body size, overlapping the range of G. paranana   sp. nov. The pattern of spots is also useful, as G. paranana   sp. nov. has larger, less distinct, pale spots and dark markings compared to G. nana   (cf. Fig. 5 View FIGURE 5 ), with the dark markings often forming short bars or networks, especially a dark streak behind the eye (absent in G. nana   ).

Owing to the close morphological resemblance of the two species, confirmation of identity is possible with genetics by obtaining a tissue sample (e.g. tail tip) to generate mtDNA SNPs and consulting the diagnostic loci provided in Appendix 2.

NTM

Northern Territory Museum of Arts and Sciences

WAM

Western Australian Museum

Kingdom

Animalia

Phylum

Chordata

Class

Reptilia

Order

Squamata

Family

Gekkonidae

Genus

Gehyra