The rare planktonic diatom Eunotia zasuminensis in Canada

Abstract
The planktonic diatom Eunotia zasuminensis (Cab.) Körner is reported from eight locations in Ontario, Canada. It is previously known from only four other localities in Europe and Africa and from two rivers in the U.S.A. The taxonomy of E. zasuminensis is discussed relative to similar species. Observations on the rudimentary raphe in this species emphasize its proper taxonomic position within the Eunotiales. The distribution of E. zasuminensis seems to be controlled by its apparent preference for slightly acidic or dystrophic waters.

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