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Adults of Maritrema obstipum Digenea Microphallidae were found in the intestines of 4 species of migratory birds including the sanderling Crocethia alba Kentish plover Charadrius alexandrines Mongolian plover Charadrius mongolus and rednecked stint Calidris ruficollis collected from Yubu Island Chungcheongnamdo Korea The worms of were 451265 μm in size and were easily identifiable as Maritrema species by the presence of the cirrus sac and the ringlike distribution of the vitellaria More specifically the ejaculatory duct curved posteromedially and the 2 parts of vitelline follicles were found to be distinct at the posterior end The eggs were browncolored and 198123 μm in size All these findings implicated M obstipum as the pertinent species of the worms Beside these adult worms of Gynaecotyla squatarolae Parvatrema duboisi and Acanthoparyphium sp were also discovered This is the first report establishing migratory birds as the natural definitive hosts for M obstipum

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