Halamphora moncheviana sp. nov., valves from the type population from South Bay A–H LM views of several valves G represents the holotype I SEM of an entire valve externally, showing the dorsal striae and the raphe endings J SEM, detail of the areolae externally, showing the recessed porous foramina K SEM, detail of the striae and areolae internally, showing the porous internal areolar foramina L SEM of an entire valve internally M SEM, external view of a valve with areolae arranged in longitudinal lines, most likely in a state of development. Scale bars: 10 µm (A–H); 5 µm (I, L, M); 1 µm (J, K).