A new species of (Anura, Arthroleptidae) from the south-eastern slope of the Ethiopian Highlands, with notes on the species complex and the revalidation of a previously synonymised species.

A new ground-dwelling species of treefrog in the genus is described from the Harenna Forest in south-eastern Ethiopia. The description is based on morphology and acoustics and is supported by molecular data. The new species has a small body size, and the digital discs on fingers and toes are significantly more conspicuous than in other semi-fossorial members of the complex. It occupies forest habitats at lower altitudes and is separated ecologically and geographically from high-altitude species of the complex. One of them, a parapatric cryptic species from Bale and Arsi Mountains, is resurrected from synonymy of and given a new name, . Genetic barcoding of specimens from both populations showed that they belong to two distinct lineages that had been revealed by recent phylogenetic research. To confirm the geographic separation of the studied populations, the collection area of types was verified through analysis of the diary and the final report of the 2 expedition of V. Bottego, and through matching of the route described in it with modern maps. The type locality of sensu stricto is restricted to Gamo Gofa, Ethiopia. Following the results of recent phylogenetic studies, the range of is limited to west of the Great Rift Valley. An identification key to the named Ethiopian species of the genus is provided.