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Abstract
Fossula, gen. nov., type Fossula arctica spec, nov, is described from Arctic waters influenced by sea ice. It forms ribbon shaped colonies like Fragilariopsis and Fragilaria but differs from these genera in valve and band structure. It differs from Fragilariopsis by having a sternum in the middle of the valve, a labiate process and no raphe, and from Fragilaria (e.g. F. capucina, F. crotonensis and F. striatula) by the cell apices having one row of larger, elongate openings in the valve mantle midway between valve face and valve margin and another irregular row of smaller openings closer to the margin, and by bands with vertical columns of poroids. Fossula arctica is distinguished from Arctic Fragilariopsis species and from Fragilaria striatula also by the shape and location of the chloroplasts.
