Abstract
Cocconeis sedimentaria sp. nov. usually occurs associated with SE Pacific bottom sediments but is also epiphytic on green macroalgae. The valves are frequently orbicular, 13-35 μm long and the transapical axis 10-27 μm wide. The sternum valve (or araphid valve) is only submarginally convex, depressed towards the margins and concave towards the sternum. The raphe-stemum valve (or raphid valve) is submarginally concave, elevated towards the sternum and the valvar margin. The raphe is straight and filiform and lies in a narrow sternum. The valvocopula is open at one end and bears fimbriae. Both valves have uniseriate striae. Morphological and structural relationships with similar taxa are discussed.
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