FIGURES 49–54 in New Amphicocconeis (Bacillariophyta) from Raivavae and Tahiti Islands (South Pacific) and Porto Belo (Brazil), with re-examination of Psammococconeis

FIGURES 49–54. Amphicocconeis ruatara sp. nov. SEM (material RAI 20 from Raivavae, Austral Islands, South Pacific). SV in external view, note the axial rows of long areolae, crista marginalis and marginal row of small and dense areolae (Figs 49–50), SV in internal view (Fig. 51), SVVC in advalvar view with short fused fimbriae (Fig. 52), detail of the SVVC head pole with low fimbriae (Fig. 53), and irregular rows of pores (Fig. 54). Scale bars: 3 µm (Figs 49–52), 1 µm (Figs 53–54).