Valves disc-shaped, with narrow mantle. Valve face may be flat or transversely undulate. Central area is distinct and isolated from the marginal chambered striae. Central area covers 1⁄ 2 to 1⁄ 3 of the valve face and contains 1-4 fultoportulae. The number of costae in 10 µm is 12-15. Length of diameter in this sample ranged from 10.35-16.9 um.