Navicula sp. 2

Al-Handal, Adil Y., Torstensson, Anders & Wulff, Angela, 2022, Revisiting Potter Cove, King George Island, Antarctica, 12 years later: new observations of marine benthic diatoms, Botanica Marina (Warsaw, Poland) 65 (2), pp. 81-103 : 93

Navicula sp. 2 ( Figure 112 )

Description: Valve elliptic with broadly rounded apices, 9– 12 µm long, 4–6 µm wide. Raphe weakly undulating, proximal raphe endings small and round, terminal endings hooked into same direction and not reaching valve mantle. Axial area elliptic, central area not distinguished from the axial area. Striae radiate, 20–22 in 10 µm, middle striae are shorter.

Remarks: This is a very small species which is very difficult to resolve in LM.

Ecology and distribution: Marine benthic species. Rare in Potter Cove.

Figures

Figures 107–112: SEM images of the marine benthic diatoms in Potter Cove,King George Island, Antarctica,summer 2015.(107,108) Porosira glacialis, internal valve view showing the single marginal labiate process. (109–111) Entopyla ocellata, (109, 110) external valve view showing the wide and superficial apical porefield which occupies large area of valve face, (111) internal valve structure showing the narrow and crescent-like rimoportula openings (white arrows). (112) Navicula sp. 2.