Subdivision of the tribe Oligaphorurini in the light of new and lesser known species from North-East Russia (Collembola, Onychiuridae, Onychiurinae)

The paper is devoted to a taxonomic review of Oligaphorurini from the north-eastern part of Palaearctic. Two new species, i.e. Oligaphoruraambigua sp. n. and Oligaphoruraduocellata sp. n., are described. Four species, Oligaphoruranataliae (Fjellberg, 1987), Oligaphorurainterrupta (Fjellberg, 1987), Oligaphorurapingicola (Fjellberg, 1987), and Micraphoruraalnus (Fjellberg, 1987), are redescribed on base of the types and new material, and remarks on other species known for the region, Oligaphoruragroenlandica (Tullberg, 1876), Oligaphoruraursi (Fjellberg, 1984), Oligaphoruraaborigensis (Fjellberg, 1987), and Micraphoruraabsoloni (Börner, 1901), are given to clarify their generic affiliation. Finally, merits and disadvantages of the current subdivision of the tribe are discussed and a key to the northern species of the tribe is provided.