A total of 107 individuals of Cobitis taenia and C. elongatoides, as well as polyploid biotypes C. elongatoides x Cobitis sp. and C. taenia x Cobitis sp. from five localities in Poland were subject to parasitological examination. Four trematode species (Diplostomum sp., Tylodelphys clavata, Posthodiplostomum cuticola - all metacercariae, and Allocreadium transversale) and one nematode species (Rhabdochona ergensi) were identified, described and illustrated. No clear relationship between the intensity of infection and species/ploidy level of the host was found.
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