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Revista 6-2 Jul-Dec 2007.P65 Phyllomedusa 6(2):105-118, 2007 © 2007 Departamento de Ciências Biológicas - ESALQ - USP ISSN 1519-1397 A new species of Nyctimystes (Anura, Hylidae) from Papua New Guinea and comments on poorly-known members of the genus Stephen J. Richards Vertebrates Department, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia. E-mail: [email protected] Abstract A new species of Nyctimystes (Anura, Hylidae) from Papua New Guinea and comments on poorly-known members of the genus. Nyctimystes kuduki sp. nov. is described from lower-montane rainforest in Southern Highlands Province, Papua New Guinea. It is distinguished from all other members of the genus by its moderately large size (males 58.2-61.0 mm SVL), thick yellow or gold, vertically oriented palpebral venation, lack of dermal heel appendages and presence of vocal slits in adult males. Males call from leaves adjacent to and overhanging fast-flowing streams. The advertisement call is a long series of rasping notes produced at a rate of 0.7-1.1/s, with 9-12 pulses/note and a dominant frequency of 1873-2104 Hz. Brief comments and new data are provided for the poorly-known species N. cheesmanae, N. montanus and N. semipalmatus. Keywords: Anura, Hylidae, Nyctimystes kuduki sp. nov., Southern Highlands Province, Papua New Guinea, new species, advertisement call. Introduction Guinea and nearby islands (22 species), northern Australia (1 species), and the Maluku Islands (1 The genus Nyctimystes is a group of medium species) (Menzies 2006). to very large tree frogs that are distinguished Relationships among New Guinean from other Australopapuan hylid taxa by having Nyctimystes are poorly understood. Nyctimystes a vertical pupil and a distinct palpebral venation disruptus Tyler, 1963, N. oktediensis Richards (Zweifel 1958). The genus is restricted to New and Johnston, 1993, N. papua (Boulenger, 1897), N. trachydermis Zweifel, 1983 and N. tyleri Zweifel, 1983 form a distinct and presumably monophyletic group of large, heavy- Received 10 October 2007. bodied species that share two consistent Accepted 21 November 2007. Distributed December 2007. morphological features: 1) sparse palpebral Phyllomedusa - 6(2), December 2007 105 Richards venation, and 2) mature males lack a vocal sac diameter), TYM (horizontal tympanum (Zweifel 1983, Richards and Johnston 1993). diameter), IN (inter-narial distance), EN On the basis of its large size and relatively (distance between anterior edge of eye and sparse palpebral venation Menzies (2006) posterior edge of naris), IOD (inter-orbital associated N. narinosus Zweifel, 1958 with this distance), 3FD (transverse diameter of 3rd finger group but it possesses a vocal sac and its disc) and 3FP (narrowest width of 3rd finger relationships are unlikely to be with these penultimate phalanx), 4TD and 4TP (4th toe disc species. Nyctimystes species with dense and penultimate phalanx, as for 3rd finger). palpebral venation and males possessing a vocal Calls were recorded with a Sony TCM-5000 sac include a group of medium-sized frogs (SVL tape recorder and Sennheiser ME-66 of males ~ 40-60 mm) characterised by microphone. Air temperature adjacent to calling predominantly brown coloration, slender build, males was recorded with a Miller & Weber and advertisement calls consisting of long series quick-reading thermometer. Call rate and pulse of repetitive, rasping notes (Zweifel 1980, rate were determined by dividing the total Menzies 2006). These include N. cheesmanae number of calls or pulses minus 1 by the total Tyler, 1964, a species described (as N. montana time from the beginning of the first call or pulse, Parker, 1936) from the Owen Stanley Mountains to the beginning of the final call or pulse. of eastern New Guinea, and N. daymani Terminal portions of all calls examined Zweifel, 1958, described from Mt Dayman in consisted of a series of low-energy, poorly- eastern Papua New Guinea. defined ‘sub-pulses’ that are probably a result of In this paper I describe a new species of vocal sac deflation between calls. Measurements Nyctimystes from Southern Highlands Province, of call length and pulse rate presented here Papua New Guinea that shows some similarities exclude these poorly-defined terminal to Nyctimystes cheesmanae but differs from that sequences. Thirty calls from two males were species in its substantially larger size and analyzed in detail using the AVISOFT SAS-Lab different snout shape. I also comment on the Pro sound analysis program. Coordinates were status of several poorly known members of the taken with a GPS using the Datum WGS84. FN genus. = Field number. Material and Methods Nomenclatural note Specimens are deposited in the South In a recent review of global amphibian Australian Museum, Adelaide (SAMA), and the systematics, Frost et al. (2006) treated University of Papua New Guinea Natural Nyctimystes as a junior synonym of the Sciences Resource Centre (UPNG) (Appendix Australopapuan hylid genus Litoria. Their study I). Voucher specimens were killed in demonstrated that the Australian taxon N. dayi chlorobutanol solution, fixed in 5% formalin (Günther, 1897) is more closely related to the and stored in 70% ethanol. Samples of liver Australian Litoria nannotis (Andersson, 1916) were extracted from three specimens and stored than to New Guinean N. pulcher (Wandolleck in 95% ethanol for future DNA analysis. 1911). However Frost et al. (2006) examined Measurements (to the nearest 0.1 mm) were just three specimens of two species of taken with dial calipers and a stereomicroscope Nyctimystes, and they note (page 131) “The fitted with an ocular micrometer. They are: SVL apparent polyphyly of Nyctimystes in our results (snout-vent length), TL (tibia length), HW (head may be real, although our paucity of sampling width at angle of jaws, HL (head length from tip prevents us from delimiting the problem of snout to angle of jaws), EYE (horizontal eye precisely.” Because the monophyly of New Phyllomedusa - 6(2), December 2007 106 A new species of Nyctimystes (Anura, Hylidae) from Papua New Guinea Guinean Nyctimystes with respect to Litoria + N. 0.33); snout distinctly pointed in dorsal view dayi has yet to be disputed I retain use of the (Figure 1), projecting beyond lower jaw in name Nyctimystes here. lateral and ventral views; canthus rostralis well defined, nearly straight, loreal region steep, Species Description concave; eye to naris distance slightly greater than internarial span (EN/IN 1.13); tympanum Nyctimystes kuduki sp. nov. extremely small (TYM/SVL 0.04) but well (Figures 1-6) defined, dorsal portion of annulus hidden by short, curved supratympanic fold; eyes large, Holotype – SAMA R62753 (FN=SJR 2306), prominent, clearly visible in ventral view. Pupil adult male collected on Iagifu Ridge, Moro, vertical when constricted. Iris dark brown in Southern Highlands Province, Papua New life. Nictitating membrane with thick, vertically- Guinea, 06o23.784’S, 143o13.339’E, elevation oriented ‘veins’ of pigmentation with few cross- 930 m a.s.l. on 20 October 2001 by S. Richards. veins (Figure 2). Vomerine teeth on two large, Paratypes – adult males, UPNG 10047 prominent ridges between the choanae. Tongue (FN=SJR 5005), 10048 (FN=SJR 2305), SAMA large, nearly round, indented posteriorly; paired R62750 (FN=SJR 4932), R62751 (FN=SJR vocal slits extend from behind angle of jaws to 2301), R62752 (FN=SJR 2302), same data as half-way between angle of jaws and front of for holotype except R62750 collected 30 mouth. September 1999 and UPNG 10047 collected 13 Relative lengths of fingers 3>4>2>1; all October 1999; and SAMA R62754 (FN=SJR fingers with large, prominent terminal discs with 8624), torrent at base of Iagifu Ridge, Moro, deep circum-marginal grooves. Webbing Southern Highlands Province, Papua New between fingers 3 and 4 extends to base of Guinea, 06o21.833’S, 143o13.418’E, elevation penultimate subarticular tubercle on both fingers 900 m a.s.l. on 21 November 2004 by J. Hiaso. (Figure 3). Inner palmar tubercle prominent, Etymology – This species is named for Mr. elongate; outer palmar tubercle low, poorly Max Kuduk, formerly of World Wide Fund for defined; palmar surface with low supernumerary Nature (PNG), in gratitude for his long-term tubercles. Relative lengths of toes 4>3=5>2>1; support of the author’s research in the Kikori all toes with large, prominent terminal discs with Integrated Conservation and Development deep circum-marginal grooves (Figure 3); toes Project Area. fully webbed except fourth, where webbing extends to dorsal edge of penultimate Diagnosis – Nyctimystes kuduki sp. nov. can subarticular tubercle. Inner metatarsal tubercle be distinguished from all congeners by a prominent, elongate; outer metatarsal tubercle combination of the following characters: (1) low, indistinct (Figure 3). moderately large size (males 58.2-62.0 mm Skin very finely granular (shagreened) SVL), (2) palpebral venation thick, yellow-gold, dorsally; throat and distal portions of limbs oriented vertically with few horizontal inter- smooth ventrally; chest slightly granular, connections; (3) snout nearly acuminate in becoming more coarsely granular on belly and dorsal aspect; (4) males with vocal slits; (5) upper thighs. A pale, low dermal ridge extends heels without prominent tubercles or flaps. along outer edge of upper arm between elbow and wrist. Description of Holotype – Adult male (with Color and pattern of holotype in life: at night vocal slits and calling when collected). dorsum heavily pigmented with tan-brown, Measurements and proportions are presented in relatively uniform on head (dorsally anterior of Table 1. Head moderately narrow (HW/SV axillae), becoming more blotchy darker brown Phyllomedusa - 6(2), December 2007 107 Richards Figure 1 - Dorsal view of head of (A) Nyctimystes Figure 2 - Palpebral venation of (A) Nyctimystes montanus montanus holotype (MSNG 29720), (B) N. holotype (MSNG 29720), (B) N. kuduki sp. kuduki sp. nov. holotype (SAMA R62753) and nov. holotype (SAMA R62753) and (C) N. (C) N. cheesmanae paratype (BM 1947.2.
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