FIGURES 55–58 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae

FIGURES 55–58. Cocconeis sp. 1. SEM (Anakao, West coast of Madagascar). SV external view with diamond-like loculate areolae (55– 57, arrow indicates the position of the valve apex). Entire broken frustule (57), RV biseriate on a short marginal section (58, arrowhead), RVVC with short fimbriae every three virga, oblong papillae without furrows (58, framed arrow), SVVC with short fimbriae (57, arrow). Scale bars = 3 µm (55), 2 µm (57), 700 nm (58), 500 nm (56).