11. Nais communis Piguet, 1906

Geographic distribution.

Cosmopolitan species. In the Russian tundra: Murmansk Region (Stalmakova 1974; Finogenova 1975; Timm and Popchenko 1978), the Pechora River delta (Baturina 2018), Vaygach Island (Leshko et al. 2008), the Vashutkiny lakes system (Finogenova 1966), lakes in the More-yu River basin, Lake Bolshoy Ngosovey (Baturina and Loskutova 2010), Lake Ambarty and some other lakes in the Korotaikha River basin (Popchenko 1978), lakes in the Kara River basin, lakes in the Malaya Usa River basin, lakes in the Bolshaya Usa River basin (Baturina et al. 2014b), the Yamal Peninsula (Stepanov 2016), northern part of Western Siberia (Zaloznyj 1984), the Kolyma River basin (Morev et al. 1985).

Location.

Lake Bolshoy Kharbey (67°32'44.2"N, 62°55'22.3"E; 67°32'49.9"N, 62°53'40.1"E; 67°34'3.5"N, 62°52'17.9"E); Lake K1 (67°36'27.6"N, 62°51'58.4"E); Lake D1 (67°35'52.8"N, 62°53'52.6"E); Lake Golovka (67°36'06"N, 62°55'28.6"E; 67°35'50"N, 62°55'25.3"E); Lake L (67°35'44.5"N, 62°49'39.2"E), temporary pond near Kharbey (67°58'00"N; 62°34'60"E).

Ecology.

In bulk of the studied water bodies, N. communis was observed on silted sand, boulders with moss and algal cover, and submerged macrophytes (depth 0.3-1.2 m). In Lake Golovka, it lives on a silted substrate at a depth of 7.5 m. It was also found in small lakes with moss mats floating off shore.