Abstract
Up to date, fourteen species of the genus Longidorus have been recorded from Poland. During a recent survey, L. danuvii Barsi, Lamberti and De Luca, 2007 was found for the first time. It is also the first record outside Serbia, from where it was described. Among normal females two pathological specimens were found: one bivulval with abnormal structure of the genital tract and one with deformated lip region. Description of both normal and pathological females is provided. Normal females are similar to populations from Serbia, the main difference is shorter tail in population from Poland (41.6 vs 46.4 and 46.5) and lower c′ value (1.60 vs 1.70 and 1.85).