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Abstract
The new solitary species Brandinia mosimanniae L. F. Fernandes &L. K. Procopiak is described for Antarctic Peninsula, living on rocks from intertidal to 14m depth sublittoral. Its main features are lanceolate valves with rostrate to capitate apices, narrow sternum but expanded at the centre, two conspicuous rimoportulae, one per apex, uniseriate striae composed of areolae bearing peg-like voláte occlusions and cingulum with open bands. Comparisons with allied species such as the colonial Fragilaria striatula Lyngbye and the related genera Fossula, Synedropsis and Ulnaria are made. B. mosimanniae was a common to abundant diatom within epilithic communities in all of the samples examined.
