This taxon has a linear-lanceolate valve with broad, rostrate ends. The axia area is narrow and the central area is a transverse fascia that almost reaches the margins of the valve. The terminal nodules transversly widened, and are marked by the end striae which are thicker than the rest. The terminal striae are parallel or slightly radiate and the striae in the center are distinctly radiate. The central area striae are short and irregular in length (Patrick and Reimer 1966).