Biremis ambigua (Cleve) D.G. Mann (Figures 75, 76)

Literature: (Hendey 1964: p. 233, pl. 34, figs. 5–8 [as Pinnularia ambigua]; Witkowski et al. 2000, p. 158, pl. 155, figs. 2–6).

Description: Length 32–45 µm, width 5–7 µm (middle of the valve), striae 8–9 in 10 µm.

Ecology and distribution: A widely distributed marine and brackish-water species, recorded from the Arctic and from the tropics (von Quillfeldt 2000). It has not been previously observed in Potter Cove. Frequent in the material examined.