Data presented in the paper "First record of the endoparasitic isopod Portunion maenadis (Giard, 1886) (Epicaridea: Entoniscidae) in shore crabs in the Wadden Sea and a review of its distribution in Europe"

We report on the first record of the entoniscid Portunion maenadis (Giard, 1886) in European shore crabs (Carcinus maenas L., 1758) in the Wadden Sea and provide a quantitative review of the parasite's distribution in Europe based on published literature and biodiversity database records.