Thalassiosira gracilis (Karsten) Hustedt (Figure 6)

Literature: (Hasle and Syvertsen 1997, p. 82, pl. 12; Scott and Thomas 2005, p. 99, fig. 2.50a–f).

Description: Diameter 14–18 µm.

Remarks: A small species but can be easily recognized under LM by its large central areole.

Ecology and distribution: Widely distributed in Antarctica and the Southern seas. It has not previously been observed in Potter Cove but was frequent in the examined material.