FIGURES 26–31 in Fragilaria odeloucaensis sp. nov. (Bacillariophyta, Fragilariaceae) a diatom from temporary streams in southern Portugal

FIGURES 26–31. SEM images of F. odeloucaensis sp. nov. from type material from Odelouca Stream southern Portugal. 26, 27. Internal views of two valves showing details of striation, narrow axial area and position of rimoportulae (white arrows). 28, 29. Internal view of apices of a single valve. Rimoportula is denoted by white arrow in 28. Notice raised costae and raised zigzag axial area, and depressed striae in 29. 30, 31. Collapsed frustule in side view (30) and detail of apex (31). Elements of cingulum are indicated by black arrows, blister-like depositions by wavy black arrows and volae in 31 by black arrow heads. Scale bars = 5 µm (Figs 26, 27, 30), 2 µm (Figs 28, 29), 3 µm (31).