Huia sumatrana Yang, 1991

Inger, Robert F. & Iskandar, Djoko T., 2005, A Collection Of Amphibians From West Sumatra, With Description Of A New Species Of Megophrys (Amphibia: Anura), Raffles Bulletin of Zoology 53 (1), pp. 133-142 : 137

Huia sumatrana Yang

This series agrees very closely with the holotype (FMNH 209922) and adult paratype (FMNH 209912). The fully webbed toes, the extreme sexual dimorphism in size (see Table 4), and the distinctive, dark, diagonal markings in the temporal region noted in the original description ( Yang, 1991) are particularly diagnostic. The original description has confused the sexual dimorphism in tympanum diameter. At one point the description attributes a smaller tympanum in males: ”…disk of third finger 0.61 times the tympanum, 0.44- 0.53 in females,” then ascribes a larger tympanum to males: “...tympanum 0.53 eye diameter in females, 0.62-0.74 in males” ( Yang, 1991). The tympanum of males is visibly larger than that of females (see also Table 4). Males have slightly longer heads (HL/SVL; Mann-Whitney test U=23, P<0.002). SVL and body proportions are given in Table 4. All the females measured had enlarged, non-pigmented ova.

Coloration (in preservative) is medium to dark brown above. The throat varies from immaculate whitish to heavily marked with irregular brown spots, some of which often appear also on the chest. The diagonal dark bars in front of and behind the tympanum are consistent features of the pattern. The bar behind the tympanum is continued forward above the tympanum to the rear of the eye. The bar at the shoulder mentioned by Yang (1991) is sometimes marked only by a row of small spots. The weak dorsolateral fold is usually marked by several small black spots.

The white velvety nuptial pad of males covers the medial surface of the first metacarpal and the medial and dorsal surfaces of the basal phalanx of the first finger. The distal edge of the pad is opposite the center of the subarticular tubercle of the first finger. The nuptial pad is usually constricted and in a small percentage of males the constriction divides the pad into two parts.

This species differs from the recently described Amolops (Huia) modiglianii , as noted by Doria et al. (1999), in having more extensive webbing, in the presence of an outer metatarsal tubercle, and in having the first finger longer than the second.

All but two of this large series were collected along clear, rocky streams flowing through forests at 255-405 m ASL near Padang. One frog was obtained from the rocky stream flowing through the Harau Valley (536-566 m), and one from the Batang Tarusan (1166-1170 m), near Lubuk Selasih .