Hydrophorus alpinus Wahlberg, 1844

Grichanov, Igor Ya. & Khruleva, Olga A., 2020, New records of long-legged flies (Diptera, Dolichopodidae) from Wrangel Island Nature Reserve (Chukotka AD, Russia), Acta Biologica Sibirica 6, pp. 551-562 : 551

Hydrophorus alpinus Wahlberg, 1844

Reference.

Grichanov and Khruleva 2018: 40, Fig. 5 .

Material.

1♂, 1♀, Thomas Mt. , 70°57'N 178°43' Е, gravel southern slope with spotted grassy-forb and herb-dwarf willow-moss cover, 11- 31.07.2016, L.F. Volkova ; 1♂, middle-upper reaches of Krasnyi Flag River , 71°16.952'N 178°50.154'W, wet plot in a river valley with continuous grass-dryad-sedge-moss hummocks, 4- 17.07.2016, L.F. Volkova ; 1♂, environs of Tundrovaya Mt. , 71.29776N, 179.79578W, loamy high shore with a sparse grass and wormwood cover, yellow pan traps, 6- 9.07.2019, U.V. Babiy ; 1♀, Chertov Ovrag , 70.987833°N, 179.841611°W, the lower part of the loamy-gravelly slope of the southern exposure with a spotted forb-moss-willow-dryad cover, sweeping, 26.07.2019, O.A. Khruleva ; 3♂♂, 4♀♀, Vyuchnyi brook, 71.003889°N, 179.703667°W, base and southern slope of a hill with willow-sedge-moss-dryad hummocky cover and spotted lichen-moss-herb-sedge cover, 24.07.2019, sweeping and hand collection, O.A. Khruleva ; 2♂♂, Rogers Bay env., 70.984778°N, 178.494139°W, moderately moistened middle part of gravel-loamy foothill ridge with spotted willow-sedge-moss cover, sweeping, 11.07.2019, O.A. Khruleva .

Notes. Hydrophorus alpinus

is the commonest species on the Island, but previously only one specimen has been collected outside the warmest central part ( Grichanov and Khruleva 2018). In 2016 and 2019, it was discovered in six new plots (Figs 3 - 5 ) located mainly outside the warmest inland areas, including the coast of the Island.

Distribution.

Type locality: Sweden: "Walli et Snjerack prope Quickjock". Palaearctic: Finland, Norway, Russia (Arkhangelsk, Chukotka mainland, Wrangel Island, Leningrad, Murmansk, Nenetsia, Yakutia, Yamalia), Sweden; Nearctic: Canada, USA.

Figures

Figure 3. Vyuchnyi brook. Southern gravelly slope of a hill with a " tundra-steppe " plant community; a site where Dolichopus terminasianae and Hydrophorus alpinus were collected. Photo by O. A. Khruleva.

Figure 5. Rogers Bay environs. Middle part of gravel-loamy foothill ridge with spotted willow-sedge-moss cover; a site where Hydrophorus alpinus was collected. Photo by O. A. Khruleva.