The distribution of Najadicola ingens (Koenike 1895) Piersig 1897, a hydrachnid parasite of freshwater clams in .North America, is known only from a few scattered records. Relatively few specimens have been reported up to the present. Koenike (1895) described the species from specimens found in .dnodonta fragilis Lamarck and Unio complanata (Solander)l and sent to him by Dr. Tyrrell of Ottawa. The collection locality was given only as Canada. Wolcott (1899) collected this mite from ./tnodonta fragilis at "26" Lake, near Charlevoix, Michigan, and Intermediate Lake, Ellsworth, Michigan, from Unio gibbosus Barnes, U. ligamentinus Lamarck, and Anodonta footiana Lea at Grand Rapids, Michigan, and from U. luteolus Lamarck at Long Lake, Kalamazoo, Michigan. He examined 3500 clams representing 60 species from Michigan, Wisconsin, Nebraska, New York, Illinois, Iowa, and Pennsylvania, but found not more than 16 specimens, all from the Michigan localities just mentioned. Wolcott (1918) stated that the species is generally distributed, but did not give additional distribution records. Marshall
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