Cocconeis costata var. hexagona Grunow (Figure 49)

Literature: (Riaux-Gobin and Romero 2003, p. 24, figs. 4, 5, pl. 3, figs. 1–10; Witkowski et al. 2000, p. 104, pl. 35, figs. 14, 15, pl. 38, fig. 35).

Description: Length 22–27 µm, width 9–12 µm, striae (raphe valve) 14–15 in 10 µm.

Remarks: The transverse fascia of the central area in the observed specimens did not reach valve margin as normally observed in this species (Riaux-Gobin and Romero 2003).

Ecology and distribution: Widely distributed marine benthic and epiphytic species, Reported from the Arctic (Hsiao 1980). Rare in Potter Cove.