Revision of Palearctic species of the genus Dimorphaphorura (Collembola: Onychiuridae: Onychiurinae: Oligaphorurini) with description of new species.

In this paper, the Palearctic genus Dimorphaphorura Bagnall, 1949 (Collembola: Onychiuridae), is revised. The diagnosis of the genus is defined within the tribe Oligaphorurini based on the development of the furcal area, shape of furcal rudiment, and furcal chaetotaxy. Six new species are described: D. olenae sp n. from Ukraine, D. inya sp n., D. pseudoinya sp n., D. sibirica sp n., D. caucasica sp n., and D. sophyae sp n. from Russia. The type species of the genus, D. differens Bagnall, 1949 is redescribed, and the lectotype and paralectotypes are designated. All previously known species are redescribed or with additional characters complemented: D. alnus (Fjellberg, 1987) comb n., D. chatyrdagi (Kaprus', Weiner & Pomorski, 2002) comb n., D. daii (Pomorski, Skarzynski & Kaprus', 1998) comb n., Dimorphaphorura eremia (Kaprus',Weiner & Pomorski, 2002) comb n., D. hackeri (Christian, 1986) comb n., D. irinae (Thibaud & Taraschuk, 1997) comb n., D. melittae (Christian, 1993) comb n., D. pseudoraxensis (Nosek & Christian, 1983) comb n., D. raxensis (Gisin, 1961) comb n., D. steposa (Kaprus', Weiner & Pomorski, 2002). An identification key to all Dimorphaphorura species is provided.

Revision of the genus Spinonychiurus Weiner 1996 (Collembola: Onychiuridae) with description of five new species.

The genus Spinonychiurus Weiner, 1996 is revised. This genus is assigned to the tribe Thalassaphorurini because of the structure of reduced furca--a small depression in the center of abdominal sternum IV, with 2+2 small posterior chaetae arranged in two rows. Spinonychiurus clearly differs from other members of the tribe by the division of abdominal sternum III on two subsegments, each with an own set of chaetae. Five new species, S. issykkulensis sp. nov., S. nazguli sp. nov., S. natashae sp. nov., S. alaskensis sp. nov. and S. alabelensis sp. nov. are described. Five previously known species, S. edinensis (Bagnall, 1935), S. spinularius (Gisin, 1952) comb. nov., S. subedinensis (Arbea & Jordana, 1985) comb. nov., S. tianshanicus (Martynova, 1971) comb. nov. and S. pamirensis (Martynova, 1975) comb. nov., are assigned to this genus and redescribed on the basis of the type material and new specimens. An identification key to all known Spinonychiurus species is provided.