SPHENOPHRYNE - American Museum of Natural History

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20 BULLETIN AMERICAN MUSEUM OF NATURAL HISTORY NO. 253 Fig. 8. Comparison of relative hand length and third finger disc width in Austrochaperina basipalmata (solid squares) and A. derongo (Idenburg River sample, open squares). laterally. The posterior surfaces of the thighs are brown and the groin is much the same. VARIATION IN SIZE AND PROPORTIONS: Adult males (those with vocal slits) range from 31.6 to 34.4 mm SVL, adult females from 33.3 to 39.0 mm. Males as large as 29.0 mm lack slits, and females appear to mature at about 30–32 mm. Variation in proportions is summarized in table 2; see table 3 for regression statistics. Adult males have the tip of the snout somewhat pointed and conspicuously whitened. Adult females have a rounded snout and rarely show even a trace of white, and juveniles of both sexes have dark snouts. ILLUSTRATIONS: 3rd finger terminal phalanx, fig. 71N; premaxilla, fig. 64E; sacral region, fig. 73B; vomer, fig. 65M; hand and foot, fig. 56C. CALL: Vocalizations are unknown. COMPARISONS WITH OTHER SPECIES: Austrochaperina derongo is the species most similar morphologically to A. basipalmata. They are of the same size and, apart from the toe webbing, there is little to distinguish them. The hands and digital discs of basipalmata tend to be slightly larger, and a simultaneous comparison of the HL/SVL and FD/SVL ratios of the two species provides a fairly good separation (fig. 8). See the account of A. macrorhyncha for a comparison of that species with basipalmata. HABITAT AND HABITS: Nothing has been published in this regard. However, Allen Allison (personal commun.) has informed me that basipalmata is closely associated with small mountain streams. DISTRIBUTION: Localities for this species span about 300 km in the north coast ranges, from the Tawarin River in Irian Jaya to the Torricelli Mountains southeast of Aitape, Papua New Guinea (fig. 24). LOCALITY RECORDS AND SPECIMENS EXAM- INED: IRIAN JAYA: Tawarin River (van Kampen, 1906: 169); Timena River (RMNH 4628, syntype of Chaperina basipalmata; ZMA 5875, 5876, syntypes of Chaperina basipalmata); Mt. Nomo, 16 km SSW Mt. Bougainville (BMNH 1913.10.31.248). PAP- UA NEW GUINEA: West Sepik Prov.: Mt. Somoro, Torricelli Mtns., 730–1420 m, 9 km N, 11 km E Lumi (AMNH A78176–78181); Mt. Nibo, Torricelli Mtns., 700–1550 m, 9 km N, 15 km E Lumi (AMNH A78158– 78175 [78163 C&S], A129480–129513 [129495 C&S]). REMARKS: Van Kampen (1906) described this species and macrorhyncha in the same paper. He later (1919) considered punctata (van Kampen, 1913) a synonym of basipalmata, but in 1923 placed basipalmata and punctata in the synonymy of macrorhyncha, citing intermediate specimens as the basis. Nieden (1926) followed van Kampen’s 1919 arrangement. Van Kampen (1919, 1923) included quatuorlobata in the synonymy of basipalmata (1919) and of macrorhyncha (1923), but with question. Parker (1934) examined a syntype of quatuorlobata and (presumably) compared it with a macrorhyncha from Mimika River and a syntype of punctata (which he thought erroneously to be a syntype of basipalmata), and referred all three specimens to Sphenophryne macrorhyncha. Austrochaperina blumi, new species Figure 9 HOLOTYPE: MZB 3562, also tagged UPNG 9538 (field no. Blum l979-59), collected in July 1979 by J. Paul Blum at Kosarek, elevation 1400 m, Jayawijaya District, Irian
2000 ZWEIFEL: PARTITION OF SPHENOPHRYNE 21 Fig. 9. Austrochaperina blumi, holotype, MZB 3562, SVL 26.3 mm. Jaya, Indonesia. This locality is on the north slope of the central dividing range of Irian Jaya, west of Nipsan and northeast of Anguruk. PARATYPES: All collected by J. Paul Blum in Jayawijaya District, Irian Jaya. AMNH A157795, 157796, UPNG 9529–9531, 9534, 9537, same data as holotype; UPNG 9514, 9515, Bime, 1500 m, May 1975; UPNG 9546–9548, 9550 (C&S), Bime Valley, 1500 m, May 1975. See Referred Specimen, below. ETYMOLOGY: I name this species for Dr. J. P. Blum in recognition of his important collections of frogs from Irian Jaya (e.g., Blum and Menzies, 1988). DIAGNOSIS: The following characteristics, in combination, distinguish A. blumi from other Austrochaperina: size moderately small, maximum SVL about 26 mm; fingers with moderately large terminal discs (3rd finger disc/SVL 0.031–0.040), only that of the first finger not broader than the penultimate phalanx; hands moderately large (HD/SVL 0.23–0.26). DESCRIPTION OF HOLOTYPE: Adult female (ova 2.2 mm in diameter) with the following measurements and proportions: SVL 26.3, HW 9.0, TL 11.3, EY 3.05, EN 2.15, IN 2.8, third finger disc 1.0 (penultimate phalanx 0.6), fourth toe disc 1.0 (appears slightly shrunken; penultimate phalanx 0.6), HD 6.3, FT 11.3; TL/SVL 0.430, HW/SVL 0.342, EY/SVL 0.116, EN/SVL 0.082, IN/SVL 0.106, EN/IN O.768, FD/SVL 0.038, TD/ SVL 0.038, HD/SVL 0.240, FT/SVL 0.430. Head relatively narrow; snout rounded, verging on truncate in dorsal aspect, high, rounded, and slightly projecting seen laterally; nostrils lateral, barely visible from above, widely separated but appearing close to tip of snout in lateral view; loreal region nearly vertical, shallowly concave, canthus rostralis rounded. Eyes moderately large, laterally placed and visible from beneath, EY greater than EN, interorbital span slightly greater than width of an eyelid. Tympanum small and indistinct, horizontal diameter of annulus less than one-half that of eye. Relative lengths of fingers 4 3 2 1, first well developed, all with rounded, grooved terminal discs, that on first finger scarcely broader than penultimate phalanx, others better developed, disc on third finger about 1.7 width of penultimate phalanx; subarticular and inner metacarpal elevations low, rounded, inconspicuous (fig. 56F). Toes unwebbed, relative lengths 4 3 5 2 1, all with rounded, grooved terminal discs, that on first toe scarcely broader than penultimate phalanx, others better developed, disc on fourth toe about 1.7 width of penultimate phalanx and equal to disc on third finger but apparently a bit dried and shrunken; subarticular elevations low and rounded, slightly more evident than those on fingers, a low, rounded, elongate inner metatarsal tubercle, no outer (fig. 56F). Dorsal surface of body nearly smooth, a slightly raised midvertebral line and a shallow fold from posterior corner of eye across upper edge of tympanum to forelimb insertion, no other conspicuous folds on dorsum; venter smooth. The dorsal surfaces of head, body, and limbs are pale tan with numerous small, somewhat darker, irregular spots. The end of the snout and the upper loreal region are darker than the dorsal ground color, and there is a hint of this darker color on the postocular fold. The lips are pale with darker spotting. The groin and anterior and upper posterior surfaces of the thighs are dusky. The lower posterior surfaces of the thighs are colored
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SPHENOPHRYNE - American Museum of Natural History

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