Amphora ovalis

Valves are semi-elliptic with a smoothly arched dorsal margin and slightly concave ventral margin. Valve ends are rounded. The axial area is narrow. An uninterrupted raphe ledge (a thin, elevated T-shaped structure that extends laterally to the raphe) is present. The raphe ledge is visible, extending the length of the cell and covering the dorsal and ventral striae near the axial area. The raphe is linear and arched dorsally. Proximal and distal raphe ends are deflected dorsally. Dorsal striae are interrupted transapically by intercostal ribs. The dorsal striae are slightly radiate centrally, becoming more radiate toward the apices. Ventral striae consist of an uninterrupted row of single areolae, slightly radiate centrally becoming convergent at the apices. A dorsal fascia is absent. A ventral fascia is present, extending to the ventral margin.