21. Stylaria fossularis Leidy, 1852

Geographic distribution.

North America, Europa, Asia. In the Russian tundra: the Anadyr River basin (Morev 1983b).

Location.

Lake Bolshoy Kharbey (67°33'48.2"N, 62°55'2.6"E; 67°32'48.3"N, 62°53'49.7"E); Lake K1 (67°36'27.6"N, 62°51'58.4"E; 67°36'22.1"N, 62°52'20.3"E).

Ecology.

The species is rare. It was noted in Lake Bolshoy Kharbey on silted sands (depth 9.5-13.8 m); in adjacent to Kharbey lakes is on clay substrate (depth no more than 0.8 m).