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Abstract
The morphology and fine structure of the diatom Melosira baileyi (H. L. Smith) Wolle confirms that the taxon is closely related to other species of Ellerbeckia Crawford. These include the freshwater E. arenaria (Moore ex Ralfs) Crawford and the marine E. sol (Ehrenb.) Crawford &Sims and E. clavigera (Gran.) Crawford &Sims. In formally establishing the combination with Ellerbeckia, we recognise an important link between freshwater and marine habitats and a long fossil record for the genus.