Anoplura of rodents (Rodentia) in Northern Poland. Above 100 rodents belonging to 6 species (Clethrionomys glareolus, Microtus agrestis, M. arvalis, Apodemus flavicollis, A. sylvaticus, Mus musculus) caught in the various habitations were examined. The parasites found represented three species of Anoplura: Hoplopleura acanthopus, H. affinis and Polyplax serrata. H. acanthopus appeard to be the most common parasite; it was found in all examined hosts, while mostly on the bank vole.