ИСТИНА

Iturup Island is the largest of the Kuril Islands (far eastern Russia) and is characterized by highly diverse habitats. The Tipuloidea fauna of Iturup is poorly studied as compared to other parts of the southern Far East of Russia. Alexander and Savchenko recorded 24 Tipulidae, 32 Limoniidae and 5 Pediciidae species from Iturup. In August – September 2011, we conducted an expedition, during which we collected adults of Tipuloidea in all major landscapes and habitats in different parts of Iturup. About 2000 specimens of Tipuloidea were sampled from 46 localities, mostly with net and Malaise traps. In total, we recorded 30 species of Tipulidae in 8 genera, 39 species of Limoniidae in 23 genera, and 6 species of Pediciidae in 3 genera. Seventeen Tipulidae, 22 Limoniidae and 5 Pediciidae species are recorded for the first time from the island, bringing the species number of Tipuloidea of Iturup to 105. Two species of Tipulidae are recorded from Russia for the first time. The most interesting records areTipula (Acutipula) hokusaii de Jong, Tipula (Pterelachisus) pauli Mannheims and Tipula (Pterelachisus) daitenjoensis Alexander. Tipula and Dicranomyia are the most diverse genera represented by 26 and 7 species, respectively. Antocha (Antocha) dentifera Alexander and Dicranophragma (Brachylimnophila) nemorale (Meigen) were the most abundant species in our samples. According to the updated but still incomplete knowledge, the Tipuloidea fauna of Iturup includes 13 zoogeographic components (according to Savchenko), of which species with the Japanese Manchurian, Kuril Japanese and Sakhalin Kuril Japanese ranges are most numerous, accounting together for 60% of the total species number. The Tipuloidea fauna of Iturup is most similar to the faunas of the adjacent islands Shikotan (Czekanowski Sorensen index 0.64) and Kunashir (0.58), and differs more with that of Sakhalin (0.47) and Hokkaido (0.33).