Abstract
Of the 39 species of littoral Chydoridae reported from Ontario, 7 are new for the province, and 2 are new to Canada. Higher species numbers per locality were found in the soft-water lakes of the Precambrian Shield areas as compared with the harder-water lakes of southwestern Ontario. Several species exhibited distinct differences from the original descriptions based on European material, and critical taxonomic features of these species are described and discussed.
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