FIGURES 32–36 in Morphology and taxonomy of Psammodiscus Round & Mann (Bacillariophyceae: Rhaphoneidales) with a description of the new species Psammodiscus calceatus

FIGURES 32–36. Psammodicus calceatus sp. nov., areolae structure. Figs 32–34. External views. Fig. 32. Areola (A), rotae (R) with two broken spokes (S) total = 5. Fig. 33. Rotae broken (spokes appear to = 7). Fig. 34. Areola without rota, showing ring structure (Ri). Note knob-like projections are traces of spokes (S, as a 'tree stump'). Fig. 35. Internal view of areola (A) and rota (R), with fin-like projections (F; rather than spokes). Fig. 36. Internal view of areola fracture (A), spoke (S) connecting to rota between fin-like projections (F). Note spokes located behind ring structure (Ri) and fin-like projections. Scale bars = 0.5 µm.