Species of the genus Folsomia (Collembola: Isotomidae) of northern Asia

This paper deals with the taxonomy and distribution of Folsomia species from northern Russia with special reference to the Asian regions. Eight new species are described: F. amplissima sp. n., F, ancestor sp, n., F. atropolaris sp. n., F. borealis sp. n., F. brevisensilla sp. n., F. cryptophila sp. n., F. longidens sp. n., F. palaearctica sp. n. Five species, F. taimyrica, F. regularis, F. sp. aff. altamontana, F. alpha, and F. janstachi (nom. n. for Isotomina gracilis Stach, 1962 nec Folsomia gracilis Latzel, 1922), are redescribed. F. binoculata (Wahlgren) has been recovered and redescribed. The positions off, macrochaetosa, F. magadani, and F. tesari have been defined more exactly on the basis of type material. An identification key of the northern Asiatic species of the genus is given.