Crane flies (Diptera, Tipuloidea: Tipulidae, Limoniidae) of the mountain-tundra landscapes of western Chukotka (Russia)

An annotated list of crane flies (Tipuloidea) collected in the vicinity of Pevek City (Chukotka Autonomous Okrug, northwest of Chaun Bay) was compiled based on the surveys carried out in 2011 and 2021, as well as on the collection material of the Zoological Institute RAS (St. Petersburg). The list contains 10 species of Tipulidae (120 specimens in total) and three species of Limoniidae (7 specimens), of which Tipula (Odonatisca) subarctica Alexander, 1919 and Symplecta (Symplecta) scotica (Edwards, 1938) are recorded for the first time for the Chukotka AO. The bulk of the fauna consists of the species with the Arctic/Arcto-montane ranges, some of which are restricted to the extreme northeast of Asia; one third of the species have Hypoarcto-montane ranges. The peculiar feature of the ecological composition of the fauna is the small number of hygrophilous taxa (only one species in the family Tipulidae). The Hypoarcto-montane Tipula (Vestiplex) montana excisoides Alexander, 1934 is the commonest species in the studied area. Most of the other species found around Pevek are rare there, and some are found in very small numbers, which is particularly characteristic of limoniids.