16. Nais variabilis Piguet, 1906

Geographic distribution.

Cosmopolitan species. In the Russian tundra: Murmansk Region (Stalmakova 1974; Finogenova 1975), Lake Vanyuk-ty (Finogenova 1966), Lake Ambarty and some other lakes in the Korotaikha River basin (Popchenko 1978), Lake Bolshoy Ngosovey, lakes in the Kara and More-yu Rivers basins (Baturina and Loskutova 2010), lakes in the Malaya and Bolshaya Usa Rivers basins (Baturina et al. 2014b), Yuribej River floodplain lakes (Zaloznyj 1976), North of Western Siberia (Zaloznyj 1984).

Location.

Lake Bolshoy Kharbey (67°34'42.3"N, 62°52'57.1"E; 67°32'44.2"N, 62°55'22.3"E; 67°32'49.4"N, 62°53'6.6"E; 67°31'38"N, 62°53'2.8"E); Lake K1 (67°36'27.6"N, 62°51'58.4"E); Lake Golovka (67°35'50"N, 62°55'25.3"E); temporary pond near Kharbey (67°58'00"N, 62°34'60"E).

Ecology.

The species was collected from submerged macrophytes, or stones and sand with moss cover (depth 0.2-1.3 m). It was also found in small water bodies or in humid depressions without open water.