Faculty of Biology and Environmental Protection, Department of Invertebrate Zoology and Hydrobiology, University of(L)ód(z), Banacha 12116, 90-237(L)ód(z), Poland;
Ruuhikoskenkatu 17 B 5, FIN-24240 Salo, Finland;
Department of Invertebrate Zoology and Parasitology, University of Gda(n)sk, Wita Stwosza 59, 80-308 Gda(n)sk, Poland;