FIGURES 40–43 in Novel diatom species (Bacillariophyta) from the freshwater discharge site of Laguna Diablas (Island Isabela = Albemarle) from the Galapagos

FIGURES 40–43: Luticola galapagoensis sp. nov. SEM images. External valve views. Fig. 40: a single areola per stria positioned along the valve mantle (arrow). Fig. 41: elongated stigma foramen, different from the striae forming areolae (arrow). Figs 42, 43: FIB cut of the frustule, Fig. 42: position of the hymenate areola occlusions (arrow). Fig. 43: note the longitudinal canal (arrow).