The biogeography and taxonomy of euglenophytes from the southeastern United States were studied in material from lakes, ponds and rivers of Alabama, Georgia, Kentucky, Mississippi, North Carolina and Tennessee. The 68 taxa found, 26 of which are new for this region, belong to the genera Euglena (26 taxa), Euglenaria (2), Lepocinclis (13), Phacus (25) and Monomorphina (2). The taxa occurred at low density, sometimes as a single specimen. Euglenophyte diversity was highest in ponds; rivers had the fewest taxa. Euglenophytes were present in most plankton samples.
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Wołowski et al. (2013) studied this question.