Sediment samples of Pleistocene and Holocene lakes in Minnesota yielded 48 species and subspecies of Ostracoda. One Pleistocene subspecies from glacial Lake Nemadji near Wrenshall, Minnesota is described as new: Cypricerus reticulatus wrenshallensis, n. Subsp. Six Ostracoda biofacies are recognized in Minnesota, based on chemical and physical properties of the lake basins and lake biota.
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