Frustules elongated, narrow; valve linear, isopolar, lanceolate with rounded or capitate ends.Axial area narrow – some species have a clear transverse central area. Striae parallel, with simple areolate structure in single rows - continuing on to the mantle. Pore field is present at each pole (John, 2000).
Valve linear with rounded ends; axial area narrow; striae parallel; in single rows.
Cells length 280-340 µm; width 9-11 µm.
Sites of occurrence in RSA:
In Winter 2006 Cruise, it was present in small numbers at scattered stations (refer sites map).