Valves flat, valve surface with small areolae, without rosette or central area. Areolae are nearly same size on whole valve.
Valve 75-85 µm in diameter.
Sites of occurrence in RSA:
In Winter 2006 Cruise, this species occurred occasionally in small numbers at different sites (refer sites map); maximum bundance (200 cells/l) was associated with the central part of the inner RSA (St. 30).