FIGURES 44–50 in Novel diatom species (Bacillariophyta) from the freshwater discharge site of Laguna Diablas (Island Isabela = Albemarle) from the Galapagos

FIGURES 44–50: Luticola galapagoensis sp. nov. SEM images. Internal valve views. Figs 44, 45, 48, 49 (arrows): note the opening of stigma bordered by a hemispherical lipped structure. Fig. 46: close up of the valve interior showing the hymenate occlusions of areolae (arrowhead). Figs 46, 47, 50: note the longitudinal canal near the margin of valve, protruding into the valve interior. Arrow in Fig. 50 points to an opening of the canal. Figs 49, 50: FIB cut of the valve.