FIGURES 26–31 in Chelonicola and Poulinea, two new gomphonemoid diatom genera (Bacillariophyta) living on marine turtles from Costa Rica

FIGURES 26–31. Poulinea lepidochelicola. SEM pictures taken from the holotype population from the olive ridley sea turtle carapace collected on Ostional Beach, Costa Rica. 26. External oblique view of an entire valve showing the shape of the mantle. 27. Internal view of two entire valves without girdle elements showing the raphe sternum and the covered areolae. 28. Internal detail of the headpole showing the helictoglossae and a few areolae surrounding the headpole. 29. Internal detail of the footpole with the helictoglossae and several rows of areolae surrounding the footpole. 30. Internal detail of the central area with the siliceous covering of the proximal raphe endings. 31. Internal detail of the central area. The siliceous flap covering the proximal raphe endings has been removed showing the raphe endings. Scale bar represents 1 μm except for Fig. 27 where scale bar = 5 μm.