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Contrast phase (A) and scanning electron micrographs (B and C) of the dinoflagellate Vulcanodinium rugosum. Note in (A), the cell nucleus (n). (B) Ventral view of the dinoflagellate. Note the small indentation in the c6 plate (white arrow). (C) Smaller form of the dinoflagellate revealing the arrangement of its thecal surface. Adapted with permission from Nézan and Chomérat (2011; Figures 4, 7 and 25). D) Producer of the spirolides, Alexandrium ostenfeldii.39 Scale bar = 20 μm.
