Amolops formosus, also known as Assam sucker frog, beautiful stream frog, Assam cascade frog, or hill stream frog, is a species of frog found in high gradient streams of northern India, northern Bangladesh, and Nepal, possibly also Bhutan, although these records may represent confusion between Amolops himalayanus and this species; the latest available IUCN assessment from 2004 treats A. himalayanus as a synonym of A. formosus.

Description

Adult males measure, based on the holotype only, 64 mm and females measure 63 - 73 mm in snout–vent length. The head is relatively wide. The tympanum is small but distinct. The fingers have no webbing while the toes are fully webbed; both fingers and toes bear discs. Skin is smooth. The dorsum is green with irregular distinct chocolate-coloured blotches with yellow dots. The ventral parts are light with a greenish abdomen.

Habitat and conservation

Amolops formosus is a rare frog associated with streams and riparian vegetation within tropical evergreen forest at elevations of 1000 – above sea level. It is threatened by habitat loss caused by deforestation and dams. It is present in the Namdapha National Park and Dibang Wildlife Sanctuary in Arunachal Pradesh (India).