Cymbopleura inaequalis

Valves are rhomboid-lanceolate and moderately dorsiventral, with strongly arched dorsal and ventral margins. Apices are bluntly rounded and subrostrate to rostrate. The axial area follows close to the valve midline. The axial area is sub-linear, narrowest near the apices and widening gradually toward the valve middle where it merges with a somewhat wider elliptical central area. The central area is about one-quarter the width of the valve. The raphe is lateral and narrows near the proximal and distal ends. Proximal raphe ends are straight and terminated in expanded pores. Distal raphe fissures are curved, concave toward the dorsal margin. Striae are coarsely punctate and radiate, becoming parallel only very near the apices. Striae tend to be curved toward the valve center. Areolae number 14-22 in 10 µm.