SPHENOPHRYNE - American Museum of Natural History

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36 BULLETIN AMERICAN MUSEUM OF NATURAL HISTORY NO. 253 Fig. 19. Distribution of three species of Austrochaperina: A. archboldi (open circle), A. guttata (closed circles), and A. hooglandi (triangles). HD 9.3, FT 17.6, disc of third finger 1.05 (penultimate phalanx 0.7), disc of fourth toe 1.45 (0.85); TL/SVL 0.439, HW/SVL 0.361, EY/SVL 0.095, EN/SVL 0.077, IN/SVL 0.102, EN/IN 0.756, HD/SVL 0.232, FT/ SVL 0.439, disc of third finger/SVL 0.026, disc of fourth toe/SVL 0.036. A relatively large Austrochaperina, adults about 40 mm SVL or longer, with narrow head (HW/SVL 0.353) and moderately long hind legs (TL/SVL 0.444). Snout acute but blunt, projecting beyond anterior margin of lip (fig. 21); loreal region nearly vertical, shallowly concave, canthus rostralis rounded but not obscure; nostrils directed laterally, IN greater than EN (EN/IN O.731; IN/SVL 0.105); eyes unusually small (EY/SVL 0.091), interorbital span almost twice eyelid width; tympanum small, obscure. Hands of average size (HD/SVL 0.227); all fingers and toes with distinct discs bearing marginal grooves, those of third finger about 1.6 width of penultimate phalanges, of fourth toe 2.0 (FD/SVL 0.030, TD/SVL 0.041); relative lengths of fingers 3 4 2 1, of toes 4 3 5 2 1; no trace of webbing on hands or feet; no distinct subarticular, palmar or solar tubercles, only low rounded elevations. Dorsal and ventral surfaces smooth except for slight roughening of the eyelids and top of head; a weak postocular-supratympanic fold. Male has a single subgular vocal sac. COLOR AND PATTERN: The dorsum was
2000 ZWEIFEL: PARTITION OF SPHENOPHRYNE 37 Fig. 20. Austrochaperina hooglandi, holotype, AMNH A77597, SVL 40.1 mm. pale pinkish brown after several months in preservative, and the darker markings, flecks, and mottling were dark brown. The groin, anterior and posterior sides of the thighs, and inside of the shank were light peach in color, probably being brighter and redder in life. The ventral surfaces are pale tan, almost white. The chin and hind limbs are lightly spotted and mottled with brown, the chest and abdomen immaculate. James Menzies (personal commun.) described a specimen from the Adelbert Mtns.: ‘‘dorsal mid and light brown, speckled, becoming reddish posteriorly; groins and back of thighs dull red; arms and legs as back; tympanum buffy; iris brown; throat speckled, rest of belly plain white but mottled below arms and legs.’’ VARIATION IN SIZE AND PROPORTIONS: The largest specimen is an adult female 44.2 mm SVL; the largest male is 43.4 mm SVL. A 35.1-mm female is subadult, whereas one of 37.3 mm is adult. Two males are mature at Fig. 21. Head of Austrochaperina hooglandi, AMNH A77597 (holotype) in profile; note projecting snout. 40.1 mm, but one of 28.6 mm is not. See table 2 for statistics on proportions and table 3 for regression data. As is true of some other Austrochaperina, males and females of hooglandi differ in that the snout of mature males is pale, almost white, and projects more than the darker, shorter snout of females and immature individuals. ILLUSTRATIONS: Hand and foot, fig. 55D. CALL: This has not been described. COMPARISONS WITH OTHER SPECIES: The chief distinction of A. hooglandi is in the color pattern—no other species has the dark middorsal region and pink to reddish shade of the groin and thighs. There is broad overlap of the standard morphological ratios with derongo, a circumstance confused by geographic variation of some proportions in that species. Greater eye size of archboldi (no overlap in ratios) as well as color pattern distinguish that species from hooglandi. A. guttata differs not only in color pattern, but in several proportions. HABITAT AND HABITS: Nothing specific is on record. The type locality falls in a region mapped by Paijmans (1975) as Medium Crowned Lowland Hill Forest. DISTRIBUTION: This species is known from the Hunstein, Schrader, and Adelbert Mountains, West Sepik and Madang Provinces, Papua New Guinea (fig. 19). LOCALITY RECORDS AND SPECIMENS EXAM- INED: PAPUA NEW GUINEA: West Sepik Prov.: Mt. Hunstein, 1200 m (AMNH A77592–77597); Madang Prov.: Malanga
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