22. Stylaria lacustris (Linnaeus, 1767)

Nereis lacustris Linnaeus, 1767

Nais proboscidea Müller, 1774

Geographic distribution.

Holarctic species. In the Russian tundra: Murmansk Region (Timm and Abarenkov 2018), the Pechora River delta (Baturina 2018), Lake Ambarty and some other lakes in the Korotaikha River basin (Popchenko 1978), the Poluj River basin (Zaloznyj 1976), the Yamal Peninsula (Stepanov 2016, 2017), the Ob River delta (Timm and Abarenkov 2018), northern part of Western Siberia (Zaloznyj 1984), the Anadyr River basin (Morev 1983b).

Location.

Lake Bolshoy Kharbey (67°34'34.3"N, 62°52'17.4"E; 67°32'50"N, 62°52'26.3"E); Lake K2 (67°32'55.7"N, 62°51'39.7"E); Lake K1 (67°36'29.4"N, 62°52'58.3"E); Lake Golovka (67°35'50"N, 62°55'25.3"E; 67°36'9.4"N, 62°56'39.9"E).

Ecology.

The worms are very mobile; they prefer submerged macrophytes as substrate. S. lacustris was also observed on silted stones (depth 0.3-1.0 m).