The cells have a thin membrane, outline spindle-shaped with acute ends and convex sides, rarely parallel in the middle. Raphe straight, with small, approximate central pores and little developed apical pores; axial and central areas, inconspicuous. The structure of the valve consists of transapical, parallel, and straight apical rows of areolae. The areolae are on the outside covered by a thin, siliceous membrane which has a slit of apical direction in each areola (Simonsen, 1974).
Witkowski et al., 2000: p. 739, Pl. 148: 1, 1a.
Valves delicate, narrowly-lanceolate with acute apices. Raphe straight;transapical striae in LM barely resolvable.
Cells length 120-135 µm; width 12-15 µm.
Species is similar with illustrations of Witkowski et al. (2000) for Haslea spec. cf. balearica from Mediterranean waters (p. 739, Pl. 148: 1, 1a).
Sites of occurrence in RSA:
In Winter 2006 Cruise, this species was observed at various stations (refer sites map),although never in large numbers; maximum abundance (3.6*10^2 cells/l) was associated with the Sea of Oman (St. 25a).