Pesceus schmeili (Mrázek, 1893)

Location, ecology. Only females were found on the surface of zebra mussel ( Dreissena polymorpha) from Lake Boczne in the Masurian Lakeland.

Ge ner al d i str ib ut io n a n d b io lo g y. Palaearctic, inhabits various types of water bodies, from large lakes where it is common in benthos and reaches considerable depths, to lowland swamps and springs (Borutzky 1952). Pesceus schmeili s. str. occurs throughout Europe up to and including Ural region. Widespread in Poland (Drzycimski 1985). Polycyclic (Sarvala 1990; Fefilova 2007) and oligosaprobic (Sarkka 1995).

Distinguishing features. Caudal rami widely divergent, almost three times as long as wide, with slightly narrowed and pointed tips. Outer and inner margins of caudal rami hairy.