FIGURES 16–20 in Small-sized and discoid species of the genus Cocconeiopsis (Bacillariophyta) on Holothuria atra (Juan de Nova, Mozambique Channel)

FIGURES 16–20: Cocconeiopsis juandenovensis sp. nov. (SEM) from "JDN2 Holothuria atra". Internal views. Fig. 16: Complete valve with helictoglossae (arrows). Fig. 17: Tilted apex of the valve illustrated in Fig. 16. Note virgae (short arrows), marginal rim (long arrow), and marginal row of areolae. Figs 18, 19: Note reticulate structure (short arrows) and marginal rim (long arrow). Fig. 20: Detail of edge of valvocopula, slightly undulated (short arrows). Scale bars = 2 µm (Fig. 16); 0.7 µm (Fig. 17); 0.4 µm (Figs 18–20).