Bioacoustics of Limnonectes gunungensis

Description of holotype . Adult female; SVL 38.6 mm ; body moderately sturdy, widest at temporal region, slightly tapering to groin ( Fig. 3B ); head large (HL/SVL 0.37, HW/SVL 0.38), about as wide as long (HW/HL 1.01); snout moderately long (SL/HL 0.43), subacuminate in dorsal view, rounded and slightly protruding in lateral profile, as long as wide (SL/EE 0.98); canthus rostralis weakly expressed between eye and nostril, slightly concave from eye to nostril in dorsal view; loreal region oblique; nostrils rounded, directed laterally, situated about halfway between tip of snout and eye (EN/NS 1.08), separated from each other by distance much larger than distance between eye and nostril (NN/EN 1.34); eye directed anterolaterally, moderately protruding, large (ED/HL 0.32), its diameter shorter than snout (ED/SL 0.74); interorbital distance greater than upper eyelid width (IO/EW 1.23) and smaller than internarial distance (IO/NN 0.83); pineal spot well discernible, at level of anterior upper-eyelid edge; tympanum and its annulus distinctly and fully visible, its posterior fifth obscured by thickened skin, its dorsal edge in contact with supratympanic fold; tympanum separated from eye by about half its diameter (ET/TD 0.53); tympanum diameter slightly more than half eye diameter (TD/ED 0.55); upper jaw with dentition; odontoid processes in lower jaw low, inconspicuous; choanae small, rounded, located far anterolaterally at margins of roof of mouth, lateral fifth covered by palatal shelf of maxilla in ventral view; vomer processes bearing teeth, long, separated from choana by distance about length of individual process and from each other by half length of individual process ( Fig. 4B ); tongue moderately long and broad, bilobed for about one-sixth its length, free distally for about three-fourth its length; median lingual process absent. Dorsal surfaces of head, trunk and limbs and lateral surfaces of trunk finely shagreened; dorsolateral ridge prominent, from shortly behind posterior end of upper eyelid to groin; postpalpebral ridge moderately distinct, only in anterior part of dorsum, from behind eyes to just behind level of arms; lumbar and median ridges absent; horseshoe-shaped dermal ridge low, indistinct, just behind level of arms; supratympanic fold thick and conspicuous, extending from posterior end of orbit to insertion of arm, subangular, with anterior and posterior part about equal in length ( Fig. 5B ); ventral side of head smooth; weak transverse chest fold between arm insertions; ventral side of trunk weakly areolate; ventral side of limbs smooth; cloaca without dermal flap. Forelimbs moderately sturdy; hand relatively small (HND/SVL 0.26); tips of fingers rounded, slightly enlarged into disks; relative length of fingers: II <I = IV <III; subarticular tubercles rounded, well developed, numbering one on Fingers I and II, two on Fingers III and IV, proximal tubercles on Fingers III and IV larger and more prominent than distal ones; finger webbing absent; thenar tubercle distinct, oval, prominent, about one-third length of metacarpal of Finger I; inner palmar tubercle subcircular, about as long as narrow outer palmar tubercle; palmar tubercles fused proximally on proximal half of Fingers II–IV. Hindlimbs sturdy, very long ( LEG /SVL 1.85); heel reaching slightly beyond tip of snout when legs adpressed forwardly to body; tibiofibula long (TFL/SVL 0.59), longer than thigh (TFL/THL 1.12); heels overlapping each other considerably when knees flexed and thighs held perpendicularly to median plane; foot slightly shorter than tibiofibula (FOT/TFL 0.94); relative length of toes: I <II <V <III <IV; toe tips rounded, enlarged into disks; subarticular tubercles numbering one on Toes I and II, two on Toes III and V, and three on Toe IV; pedal webbing formula I 1/2 II 1+/2+ III 1.25/2.5 IV 2.5/1+ V ( Fig. 6 ); narrow dermal ridge on preaxial side of Toe I and on postaxial side of Toe V from proximal end of metacarpus to disk; inner metatarsal tubercle prominent, elongated, about half length of metatarsus of Toe I; outer metatarsal tubercle absent. Colouration . In life, dorsum dark brown with narrow, whitish median band; limbs including fingers and toes somewhat lighter brown with regular medium brown crossbands; interorbital bar dark brown, interrupted by light median band; median band edged with dark brown on dorsal part of snout; dorsolateral fold blackish; horseshoe-shaped tubercle black laterally; fine line of black dots and speckling from posterior ends of horseshoe-shaped tubercle along median band to vent, much wider and conspicuous in posterior part; ventral side of head and chest cream-coloured with an orange tinge; limbs reddish orange; abdomen light yellow. See Fig. 7B for a photograph of a male paratype in life. In preserved state, dorsum dark brown with narrow, whitish median band ( Fig. 3B ); crossbands on limbs, fingers and toes dark brown; interorbital bar black; median band edged with black on dorsal part of snout; dorsolateral fold blackish; horseshoe-shaped tubercle black laterally; fine line of black dots and speckling from posterior ends of horseshoe-shaped tubercle along median band to vent, much wider and conspicuous in posterior part; ventral side of head and chest cream-white; limbs yellowish, abdomen hardly pigmented, blueish white. Variation. The paratypes match the holotype in general appearance. Males lack nuptial pads and have weak dermal folds parallel to posterior part of mandible on ventral side of head. The vocal sac aperture is slit-like, directed posterolaterally,situated at corner of mouth.SVLof adult males is 25.6–31.5 mm ,of adult females 30.4–39.9mm ( Table 2 ). Pedal webbing variation is I 1 [40] ,1+ [60] /2 [90] ,2+ [10] II 1 +/2+ [20] ,2.25 [60] ,2.5 [20] III 1 + [10] ,1.25 [70] ,1.5 [20] /2.5 [30] ,2.75 [30] ,3- [40] IV 2.5 [10] ,2.75 [30] ,3- [20] , 3 [40] /1+ [50] ,1.25 [50] V ( Fig. 6 ). The median dorsal band is absent in most specimens . Bioacoustics . The advertisement call and other vocalisations are unknown, but see account on bioacoustics of L. nephophilus sp. nov. below.