The Mountain Mistfrog is a moderate sized, robust treefrog growing 30 to 48 mm in length. The dorsal surface is uniform olive-brown or grey-brown, sometimes with irregular darker olive markings. The skin is smooth above, with scattered tubercles on the head and back. The ventral surfaces are granular, cream in colour with a reddish-pink flush on the limbs and pectoral region, and sometimes dotted or flecked with brown. The iris is brown. The finger and toe disks are large and conspicuous. The fingers have slight webbing, and the toes are fully webbed. The thumb of the Mountain Mistfrog is large up till the disc, which is reduced in size, giving the thumb a conical appearance. The forearm is robust in the male, with a large nuptial pad with coarse spinules. The tympanum is small and indistinct and covered by skin (Cogger 1994; Cunningham 2002; Liem 1974; Richards 1993).
The call of the Mountain Mistfrog has been described as a regularly repeated, rasping, single note call (Liem 1974), or a soft, slow, popping growl (McDonald 1992).
Mountain Mistfrog tadpoles have a depressed body and are light brown in colour with a cream patch between the eyes (less distinct in large specimens). The tail muscle is very robust, cream with distinct light brown blotches that extend into the anterior portion of the clear fins. The tail fin is low anteriorly, high posteriorly and broadly rounded at the tip. The large suctorial oral disc is surrounded with marginal and submarginal papillae. There are two tooth rows anterior to the mouth, and three posterior to it (Richards 1992).
The Mountain Mistfrog is a rainforest specialist, endemic to the Wet Tropics Bioregion (Williams & Hero 1998, 2001). It is found in upland rainforest and wet sclerophyll forest along fast-flowing streams where there is white water from riffles and cascades (Liem 1974; McDonald 1992). It is usually found perched on rocks or overhanging vegetation adjacent to the water (Liem 1974). The tadpoles are restricted to fast-flowing waters where they cling to rocks in riffles and torrents and in highly oxygenated pools below waterfalls (Liem 1974; Richards 1992). Tadpoles also burrow into loose sand under rocks which may help them withstand the violent floods that often occur in rainforest streams (Richards 1992).
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