A new minute Oreophryne (Anura: Microhylidae) from the mountains of Irian Jaya, Indonesia

A new tiny microhylid frog in the genus Oreophryne is described from the mountains of Irian Jaya, Indonesian New Guinea. Oreophryne minuta, new species, is distinguished from all congeners in the New Guinea region by its small adult size (males to 11.5 mm) and lack of expanded terminal discs on the fingers and toes. It is known from one locality in mid-montane rainforest (2000 m asl) in the rugged mountains of the Derewo River Basin, where males called from deep within thick clumps of moss growing on large boulders.