Spiders (Aranei) of Wrangel Island, Russia. 1. New data on the species composition and distribution
There is an annotated checklist of spider species of Wrangel Is. It contains previously unpublished data of 2006 as well as the results of new studies in 2014-2021. The data on distribution, biotopic association and density in various areas of the island are given for each species. In the XXI century, all the species recorded on Wrangel Is. in the XX century were recollected (except for Oreoneta mineevi Saaristo et Marusik, 2004), and 14 species were also added. Six of the latter, Dictyna major Menge, 1869, Monocerellus montanus Tanasevitch, 1983, Oreoneta alpina (Eskov,1987), Semljicola beringianus (Eskov, 1989), Styloctetor lehtineni Marusik et Tanasevitch, 1998 and Uusitaloia wrangeliana Marusik et Koponen, 2009, have been earlier recorded in the island fauna. Eight species, Agyneta decora (O. Pickard-Cambridge, 1871), A. ripariensis Tanasevitch, 1984, Hilaira proletaria (L. Koch, 1879), Oreoneta beringiana Saaristo et Marusik, 2004, Oreonetides beringianus Eskov, 1991, Tubercithorax subarcticus (Tanasevitch,1984), Thymoites bellissimus (L. Koch, 1879) and Th. oleatus (L. Koch, 1879), are recorded in Wrangel Is. fauna for the first time. Records of Agyneta trifurcata Hippa et Oksala, 1985, Alopecosa borea (Kulczyński, 1908) and Chalcoscirtus glacialis Caporiacco, 1935 are erroneous and belong to A. bulavintsevi Tanasevitch, 2016, A. pictilis (Emerton, 1885) and Ch. hyperboreus Marusik, 1991, respectively. The finding of Halorates thulensis (Jackson, 1934) needs confirmation.Accounting the new data, the spider fauna of Wrangel Is. consists of 57 species from the families Dictynidae (3species), Gnaphosidae (1), Linyphiidae (44), Lycosidae (5), Salticidae (1), Theridiidae (2), Thomisidae (1 species). The longitudinal character of the fauna defines the dominance of species with Siberian-Nearctic (39%) and Siberian (30%) ranges, whereas the latitudinal one determines the abundance of species with mainly arctic and arcto -alpine/montane distribution type (81%). At the same time, Wrangel Is. is the only place of finding for 20 species (35%) in the High Arctic. Basically all of them are confined by the island areas with most favorable mesoclimatic conditions.