18. Ripistes parasita (Schmidt, 1847)

Stylaria parasita Schmidt, 1847

Ripistes rubra Lastočkin, 1926

Geographic distribution.

Holarctic species. In the Russian tundra: Murmansk Region (Veselov 1977; Timm and Popchenko 1978), lakes in the More-yu River basin (Baturina and Loskutova 2010), the Pechora River delta (Baturina 2018), northern part of Western Siberia (Zaloznyj 1984).

Location.

Lake Bolshoy Kharbey (67°34'42.3"N, 62°52'57.1"E; 67°34'3.5"N, 62°52'17.9"E; 67°33'45.9"N, 62°54'34.7"E; 67°32'44.2"N, 62°55'22.3"E; 67°32'50"N, 62°52'26.3"E; 67°31'38"N, 62°53'2.8"E); Lake L (67°35'41.5"N, 62°49'34.7"E; 67°35'46"N, 62°49'44.8"E); Lake K2 (67°32'56.1"N, 62°51'39.7"E); Lake K1 (67°36'27.6"N, 62°51'58.4"E; 67°36'22.1"N, 62°52'20.3"E); Lake Golovka (67°35'50"N, 62°55'25.3"E; 67°36'9.1"N, 62°55'50.6"E).

Ecology.

The worms were often found in silt, less often on sandy-stony substrate with algae and moss cover, or on submerged macrophytes (depth 0.2-2.5 m, occasionally up to 6.0 m).