New data to the knowledge on the Harpacticoida (Crustacea, Copepoda) fauna in Poland

Harpacticoida is the least known group of Copepoda in freshwater habitats in Poland, although they are very common and very abundant in the continental waters. The last detailed taxonomic studies of Harpacticoida in Polish inland waters were carried out about 100 years ago. A faunistic and ecological review of 12 harpacticoid species from north-eastern Poland is presented herein for the first time. Two species new to the Polish fauna were recorded: Elaphoidella elaphoides (Chappuis, 1923) and Bryocamptus (Rheocamptus) spinulosus (Borutzky, 1934). Bryocamptus spinulosus is morphologically close to B. zschokkei (Schmeil, 1893). The latter species is considered to be widely distributed in Poland, yet many records of B. zschokkei might in fact refer to B. spinulosus. Distinguishing features of these species were described in detail.