Abstract
Rhopalocera fauna of steppe communities in the Middle Lena River valley (Central Yakutia) is represented by 50 species from 35 genera and 6 families, with prevalence of Nymphalidae (35,3% of total species). The xerophilic and mesophilic species inhabit steppe communities, meadow-steppe species dominate here. Percent of eu-steppe species (Pseudophilotes jacuticus, Melitaea phoebe, Triphysa nervosa, Boeberia parmenio, Erebia polaris, E. rossii) is small in collected samples (4%). Analysis of faunal similarities of steppe communities showed that studied communities form 3 groups: South-Western, Central-Yakutian and Mountain-Steppe. Distribution of species inhabiting steppe communities of Middle Lena is mainly characterized by wide longitudinal extent. At the same time, West Central Palaearctic, Euro-Siberia-Central Asian and South Siberian-Daurian-Mongolian species are recorded here; they inhabit the warmest habitats of Central Yakutia.
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