FIGURES 7–12 in New Amphicocconeis (Bacillariophyta) from Raivavae and Tahiti Islands (South Pacific) and Porto Belo (Brazil), with re-examination of Psammococconeis

FIGURES 7–12. Amphicocconeis catharinensis sp. nov. SEM (Brazilian material ICN n° 91485, Zimbros, Porto Belo, Brazil). SV in external view with a narrow sternum (Fig. 7), crater-like areolae with opening bordered by digit expansions (Figs 8–9, arrowheads), mantle ornamentation with oblong areolae and granulate depressions (Figs 8–9, arrows), SV internal views (Figs 10–12), with areolae closed by convex hymenes, SVVC with large pores (Figs 11–12, arrowheads), a part of the RV still present (Fig. 11, framed arrow). Scale bars: 5 µm (Figs 10–11), 4 µm (Fig. 7), 1 µm (Figs 8–9, 12).