Freshwater Gasłrołricha of Poland. IV. Gastrotricha from fish ponds in the vicinity of Siedlce

A b str a ct. In the course of studies carried out on gastrotriclis of fish ponds in the vicin ity of Siedlce (central-east Poland), 39 species were recorded, including 5 very lik ely new to science. Id en tity of Chaetonotus magnus w ith Ch. robustus was evidenced. The present studies provided the third record ever of the occurrence of Ichthydium bifurcatum. Ch. multisetosus, Ch. acanthocephalus and Heterolepidoderma tenuisquamatum were for the third tim e re­ ported from Poland in the course of the present research.