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Litoria kroombitensis sp. nov. Kroombit Treefrog Figs 2 A���C, 3���6 & 10 Holotype: J 91640, adult male, collected at Kroombit Ck, Kroombit Tops (24 �� 23 ��0 3 ��S, 151 ��00��0 5 ��E), south-east Queensland, by H. B. Hines & C. J. Hoskin, on 7 December 2010. Paratypes: J 40160, J 40162, J 40163, J 40164, Kroombit Ck crossing, Ubobo Rd, Kroombit Tops (24 �� 22 ��S, 151 ��01��E); J 42167, Kroombit Tops (24 �� 22 ��S, 151 ��01��E); J 42184, Kroombit Tops (24 �� 22 ��S, 151 ��01��E); J 42474, Beauty Spot 98, Kroombit Tops (24 �� 22 ��S, 151 ��01��E); J 42475, Beauty Spot 98, Kroombit Tops (24 �� 22 ��S, 151 ��01��E); J 42747, Three Moon Ck, Kroombit Tops (24 �� 22 ��S, 151 ��01��E); J 42748, Three Moon Ck, Kroombit Tops (24 �� 22 ��S, 151 ��01��E); J 72662, Kroombit SF (24 �� 23 ��0 9 ��S, 151 ��00�� 11 ��E); J 72664, Kroombit SF (24 �� 23 ��0 9 ��S, 151 ��00�� 11 ��E); J 72665, Kroombit SF (24 �� 23 ��0 9 ��S, 151 ��00�� 11 ��E); J 72666, Kroombit SF (24 �� 22 ��0 7 ��S, 150 �� 59 �� 50 ��E); J 86681, Munholme Creek headwaters, Kroombit Tops NP (24 �� 24 �� 55 ��S, 151 ��02�� 19 ��E); J 91638, Kroombit Ck crossing, Kroombit Tops (24 �� 23 ��0 3 ��S, 151 ��00��0 5 ��E); J 91639, Kroombit Ck crossing, Kroombit Tops (24 �� 23 ��0 3 ��S, 151 ��00��0 5 ��E); J 91641, Kroombit Ck crossing, Kroombit Tops (24 �� 23 ��0 3 ��S, 151 ��00��0 5 ��E); J 91658, Kroombit Ck crossing, Kroombit Tops (24 �� 23 ��0 3 ��S, 151 ��00��0 5 ��E). Diagnosis. A small (Litoria kroombitensis sp. nov. can be distinguished from similar congeners by a combination of the following traits: body size (male SVL 28.0��� 32.1 mm; female SVL 31.7���43.5 mm); head shape (HW/HL 1.22���1.40); upper lip pattern typically consisting of prominent white markings broken by a darker bar below the front of the eye; thin gold line bordered below by a dark band or line extending from nare to above forelimb; prominent white gilding on the trailing edges of the fore- and hindlimbs; fairly even green or greenish-brown dorsum; mating call consisting of whine followed by one or more chirps, with the whine being short (0.160��� 0.229 s) and of fast pulse rate (500���656 pulses/s), and the chirp being of slow pulse rate (34���48 pulses/s). Litoria kroombitensis sp. nov. is also genetically distinct from congeners, for example being a highly divergent monophyletic lineage for 16 S mtDNA (see Genetics). Etymology. Referring to the restriction of this species to Kroombit Tops, with the - ensis extension being latin for ���belonging to���. The epithet is to be treated as a noun in apposition. Description of holotype (Fig. 3). J 91640; male. Measurements (mm): SVL 29.3; HLL 15.0; FL 7.2; HW 10.4; HL 8.3; EN 2.9; IN 2.1; ED 2.9; 3 DW 1.4. Head: Broad and flattened, equal width to body; snout truncate in dorsal view and blunt and gently rounded in profile, canthus rostralis angular, loreal region steep, nostrils much closer to tip of snout than to eye, nostrils directed dorso-laterally; eye very large, diameter equal to eye to naris distance, horizontal pupil; internarial distance less than distance from eye to naris (EN/IN: average 1.42, range 1.28���1.59); tympanum moderate size and distinct. Body: Inversely triangular; urostyle indistinct; cloaca positioned immediately below urostyle, oriented posteriorly, no ornamentation. Limbs: Hindlimbs long and slender; forearms broad; pale distinct ridge (gilding) along the trailing edge of the forearm, on the heel and along the trailing edge of the foot; basal webbing on fingers, connecting the proximal phalanges (webbing formula: I 1 ��� 1 �� II 1 ����� 2 III 2 ��� 1 �� IV); toes nearly fully-webbed (webbing formula: I 1 ��� 1 II 0��� 1 III 0���1 �� IV 1 ���0 V); fingers long, relative length III>IV>II>I (II and IV about equal in length), finger discs fleshy and rounded, obviously expanded from penultimate phalanx, first finger short with disc obviously expanded; small, rounded subarticular tubercles under joints of fingers; a broad, long and ovoid, black nuptial pad (heavily stippled) covers the base and inside of the first finger; indistinct low, rounded tubercle present in the centre of the base of the palm; relative length of toes IV>V>III>II> 1 (III and V about equal in length), rounded toe discs expanded from penultimate phalanx, disc on first toe expanded; small, oval inner metatarsal tubercle; low, rounded outer metatarsal tubercle; small, rounded subarticular tubercles under joints of toes; discs on fingers larger than discs on toes. Skin: Ventral surface of chest and belly coarsely granular; throat and undersides of thighs and forearms smooth, pectoral fold absent; dorsal surface of body, head and limbs smooth to finely granular; distinct postorbital skin fold extending along dorsolateral surface to above forelimb. Colour pattern in life: (Fig. 2 B). Dorsal surfaces of head, body and legs green, suffused with coppery brown. Several tiny black dots scattered on back and top of head. Broad dark grey band extends from tip of snout, through naris to eye and then extends above tympanum and becomes diffuse above forelimb. From behind eye this band is bordered above by a thin gold line. Prominent white along upper lip from below naris to below tympanum, broken by grey bar below front of eye. Tympanum green, smudged with brown. Iris copper-coloured. Copper colouration along the top-line of the folded hindlimb and to a lesser degree on the leading edge of the forearm. Thin white edge (gilding) to the trailing edge of the fore- and hindlimbs. Top of hands and feet pale with grey mottling; top of discs translucent pale yellowish grey. Nuptial pad black. Flanks merging from green-brown dorsal colour to pale ventral colour, and finely spotted with white. Chin, chest creamy white; belly a pale reddish colour. Posterior thigh orange-red. Groin orange with a purple hue. Axilla orange. Ventral surfaces of hind and forelimbs orange-red; undersides of hands and feet yellowish orange. Colour pattern in preservative (Fig. 3): Dorsum greyish brown overlain with greyish blue on forehead and top of eyes and on top of forelimbs, lower legs and feet. Orange tinge to posterior thigh. Top of feet and hands pale. Thin white line on trailing edge of forearm and heel and trailing edge of foot. Darker dorsum merges gradually on flanks to creamy undersides. Ventral colour cream. Pale edge to upper lip broken below front of eye. Pale upper lip markings extend as broken line below tympanum to forelimb. Tympanum dark. Groin as for flanks (grey-cream). Eye copper-grey with fine black venation. Urostyle pale. Description of type series (N = 20, 15 males and 5 females). See Table 1 for measurements and proportions of type series. Head: Broad and flattened, equal width to body; snout truncate in dorsal view and blunt and gently rounded in profile, canthus rostralis moderately angular to angular, loreal region steep, nostrils much closer to tip of snout than to eye, nostrils directed dorso-laterally; eye very large, diameter greater than or equal to eye to naris distance, horizontal pupil; internarial distance less than distance from eye to naris; tympanum moderate size and distinct. Body: Slender and tapering in males, rotund in females; urostyle moderately prominent to indistinct; cloaca positioned immediately below urostyle, oriented posteriorly, often pale ornamentation. Limbs: Hindlimbs long and slender; forearms robust; pale distinct ridge (gilding) along the trailing edge of the forearm, on the heel and along the trailing edge of the foot; basal webbing on fingers, connecting the proximal phalanges; toes nearly fully-webbed; fingers long, relative length generally 3> 2> 4> 1 (2 and 4 about equal in length), finger discs fleshy and rounded, obviously expanded from penultimate phalanx, first finger short with disc obviously expanded; in males, base of thumb swollen and covered with a heavily stippled area forming a prominent brown or black nuptial pad on the inner base of the first finger; prominent small, round subarticular tubercles under fingers; indistinct low, rounded palmar tubercle on some individuals, several small, low tubercles on others; relative length of toes generally 4> 3> 5> 2> 1 (3 and 5 about equal in length), rounded toe discs expanded from penultimate phalanx, disc on first toe expanded; prominent small, round subarticular tubercles under toes; small oval inner metatarsal tubercle; moderately distinct to indistinct ovoid or round outer metatarsal tubercle; discs on fingers larger than discs on toes. Skin: Ventral surfaces granular to finely granular, typically finer under chin and generally smooth under forelimbs and chest; dorsal surface of body, head and limbs smooth to finely granular; distinct supratympanic skin fold extending from behind eye to forelimb. Colour pattern in preservative: Dorsum of males greyish brown overlain with greyish blue on forehead and top of eyes and on top of forelimbs, lower legs and feet. Dorsum of females bluish grey. Posterior thigh washed orange or pinkish. Top of feet and hands pale. Distinct to indistinct thin white line on trailing edge of forearm and heel and trailing edge of foot. Darker dorsum merges gradually on flanks to creamy undersides. Ventral colour cream or white. Pale edge to upper lip, broken below front of eye by dark band from eye to lip. Pale upper lip markings extend as broken line below tympanum to forelimb. Tympanum dark. Groin as for flanks (grey-cream). Iris dark or copper-grey with fine black venation. Urostyle often pale. Colour pattern in life (Fig. 2 A���C). Dorsal surfaces of head, body and legs typically uniform bright green, dark green or olive brown, sometimes brown or two-tone green and brown (e.g. J 91640). Sometimes tiny black dots scattered on back (e.g. J 91640). Thin gold line extends from nare, over eye and tympanum, to above forelimb. Bordered below by a dark band, typically a broad dark grey or brown band, but sometimes a narrow black line (e.g. J 91613). Black band below the gold is completely absent (or reduced to flecks) on some individuals (e.g. J 91611). Broken band of white markings along upper lip, extending from below nare to behind jaw angle. White markings typically prominent, especially from below centre of eye to below tympanum. In many individuals white markings extend to above insertion of forearm and onto upper surfaces of forearm (e.g. J 91613). In some females, white lip markings are reduced to thin broken line (e.g. J 91611). Typically a prominent dark bar (grey, brown or green) extends from below front of eye to lip, breaking up the white upper lip band. Lip bar generally more prominent in males. White markings and bar on lip are very prominent on subadults (Fig. 4). Tympanum usually green, rarely brown; typically matching the laterally adjacent skin colour, making the tympanum indistinct. Iris gold or copper-coloured. Typically a thin gold line along the topline of the folded hindlimb and often also on the leading edge of the forearm. Thin but prominent white edge (gilding) to the trailing edge of the fore- and hindlimbs. Top of hands and feet pale with grey mottling; top of discs translucent yellow or pale. Nuptial pad in males brown or black. Flanks merging from dorsal colour to pale ventral colour, typically appearing finely spotted with white. Chin, chest and belly white, sometimes tinged cream on belly. Posterior thigh orange or deep red. Groin orange or marked with a small translucent purple patch. Axilla pale orange or cream. Ventral surfaces of hind and forelimbs orange or greyish orange; undersides of hands and feet yellowish orange. Sexual dimorphism. Females are larger than males, being an average of 1.25 times the SVL of males (Table 1). Overall body shape also differs, with females being rotund in body shape (body width is wider than head), whereas male body width starts equal to head then tapers as an inverse triangle. The sexes are otherwise similar in body proportions (Table 1). Colour in preservative differs between the sexes. Male dorsum is greyish brown, whereas female dorsum is bluish grey. Male ventral surfaces in preservative are cream, whereas females tend to be white. Breeding males have obvious dark nuptial pads. Colour in life is similar between the sexes, with a few subtle differences. Females are typically brighter green than males. The thin gold line from nare to above forelimb typically more distinct in females, whereas the band below this line is typically thicker and more obvious in males. Upper lip markings (white band broken by darker bar) generally more prominent in males than females. Tadpole description (Gosner stages 28���39). Body and tail measurements are presented in Table 2. Total length of tadpole at Gosner Stage 39 = 32.8 mm. Body: ovoid and wider than deep with flattened abdomen; widest halfway along body (Fig. 5). Snout bluntly rounded in lateral view. Eyes dorsolateral, prominent in lateral view, with slight anterior and dorsal tilt. Nares large and narrowly spaced with slight anterior and lateral tilt; situated dorsally, near end of snout. Rim of nares raised. Spiracle lateroventral in position, opening dorsoposteriorly just below the longitudinal body axis. Inner wall and margin of spiracle opening flush with body surface. Vent tube dextral, opening dorsoposteriorly; moderately long and contiguous with ventral edge of lower fin. Tail: one-and-ahalf times as long as body with moderately shallow fins. Dorsal fin slightly arched, rising gently from back of body; highest half-way along tail. Ventral fin not arched and shallower than dorsal fin. Fins tapering to a rounded point posteriorly. Tail musculature robust, with maximum tail height greater than half of body depth. Oral disc: ventral, near front of snout. Posterior and lateral margins of oral disc fringed with papillae (see Figure 6). Anterior margin of oral disc lacking papillae and flush with underside of snout. Very few submarginal papillae. Jaw sheaths darkly pigmented and shallow. Labial tooth row formula: 2 (2)/ 3 (1). Gap in second anterior tooth row broad; gap in first posterior tooth row narrow and difficult to discern without a dissecting microscope. Evidence of tooth wear common in anterior tooth rows, with first anterior tooth row incomplete in most specimens examined. Deformation and discolouration of keratinised jaw sheaths was seen in specimens collected from Kroombit Creek in December 2010, but not in specimens collected from Three Moon Creek in March 2011. Colour in life: Body brown above with areas of darker subcutaneous pigment over the braincase and gut. Darker pigment also concentrated around nares. Eyes also dark, and prominent in dorsal view (Fig. 5 B). Tail musculature off-white with fine grey-brown stippling, contrasting with dark brown of body in dorsal and lateral view. Darker pigment on tail musculature more obvious dorsally, occasionally forming indistinct bands, but mostly uniform or mottled. Tail fins semi-transparent, with sparse grey-brown stippling along dorsal fin. Ventral fin largely unpigmented. Gut dark in lateral view, lightening ventrally. Iris copper-gold and bisected by dark (black) lateral stripe. Ventral body surface largely unpigmented, with diffuse layer of silver-gold iridophores over ventrolateral and lateroventral body surfaces. Coiled intestine, gills and heart clearly visible through ventral body wall, especially in earlier stage tadpoles; becoming fainter in later stage (post Gosner 35) tadpoles. Colour in preservative: as in life, except for absence of silver-gold pigment over lateral body surfaces and copper-gold in iris. Early stage tadpoles: Preserved specimens younger than Gosner stage 28 were not available for study. Recently hatched tadpoles (Gosner stage 24���25) seen in the field, however, are more round-bodied and somewhat darker above compared with late stage larvae. Comparison with tadpoles of other species: Tadpoles of L. kroombitensis sp. nov. are very similar to tadpoles of both L. pearsoniana and L. barringtonensis. Tadpoles of L. kroombitensis sp. nov. can be distinguished from L. barringtonenis on the basis of colouration, with L. barringtonensis tadpoles being significantly darker above (see Anstis 2002). Tadpoles of L. kroombitensis sp. nov. appear to be indistinguishable from those of L. pearsoniana. In the field, tadpoles of L. kroombitensis sp. nov. may be confused with early stage tadpoles of Mixophyes fasciolatus, Limnodynastes peronii and L. chloris. Early stage tadpoles of M. fasciolatus and L. peronii can be distinguished from L. kroombitensis sp. nov. on the basis of labial tooth-row formula, with the former two species possessing 3 or more anterior tooth rows from Gosner stage 25 onwards (E. Meyer, unpub. obs.; see Anstis 2002). Early stage (Gosner stage 25���26) L. chloris tadpoles differ from L. kroombitensis sp. nov. tadpoles in having eyes more lateral in position and a more cylindrical vent tube (see Anstis 2002). Call. A short, crisp whine followed by one or two chirps, ���weeak kik��� or ���weeak kik kik��� (Fig. 7). Call characteristics are outlined in Table 3. Comparison. Only likely to be confused with other members of the L. citropa species-group. Litoria kroombitensis sp. nov. is readily distinguished from the larger members of this species-group (L. citropa, L. subglandulosa and L. daviesae) by its smaller size (males 28���32 mm vs males 35���57 mm for latter three species), lack of prominent submandibular glands, and more uniform dorsal colouration. Distinguished from L. piperata by larger size and fairly uniform dorsal colouration (vs heavily mottled in L. piperata). Distinguished from L. phyllochroa and L. nudidigitus by colouration of the canthal region. Both L. phyllochroa and L. nudidigitus have a prominent white or gold canthal stripe bordered below by a sharply defined black stripe of equal thickness, and an unmarked green upper lip. In contrast, L. kroombitensis sp. nov. has a thin gold canthal stripe bordered below by a darker band or thin black line that is not so clearly defined, and prominent white along the upper lip that is typically broken below the eye by a darker bar. Also readily distinguished from all the aforementioned species by mating call. Litoria kroombitensis sp. nov. is most similar to L. pearsoniana and L. barringtonensis, from which it can be diagnosed in a number of ways. Litoria kroombitensis sp. nov. attains a larger size than L. pearsoniana and L. barringtonensis, for both males and females (Table 1). Male and female L. kroombitensis sp. nov. generally ha
Published as part of Hoskin, Conrad J., Hines, Harry B., Meyer, Ed, Clarke, John & Cunningham, Michael, 2013, A new treefrog (Hylidae: Litoria) from Kroombit Tops, east Australia, and an assessment of conservation status, pp. 426-446 in Zootaxa 3646 (4) on pages 429-442, DOI: 10.11646/zootaxa.3646.4.6, http://zenodo.org/record/215845 |
