FIGURES 28–32 in Bicudoa amazonica gen. nov. et sp. nov. (Bacillariophyta)-a new freshwater diatom from the Amazon basin with a complete raphe loss in the Eunotioid lineage

FIGURES 28–32. SEM micrographs of Bicudoa amazonica in internal view. Apices details showing the absence of structures typical of Eunotiophycideae (raphe, helictoglossae and rimoportulae). Fig. 28 Valve with vestigial raphe at both extremities (arrows); Fig. 29 Detail of apex with no vestigial raphe; Figs 30–32 Vestigial slit (Figs 30–31) until the complete raphe loss (Fig. 32) in different individuals of the type population. Raphe slits rarely found. Striae interrupted and misaligned near the ventral margin. Scale bars: Figs 28–29: 10 µm; Figs 30–32: 5 µm.