FIGURES 23–25. Planothidium galaicum. Type population. SEM micrographs. Fig. 23 in Planothidium galaicum sp. nov. (Bacillariophyta, Achnanthidiaceae), a new diatom species from Galician coast, Spain

FIGURES 23–25. Planothidium galaicum. Type population. SEM micrographs. Fig. 23. External view of the rapheless valve. Fig. 24. Internal view of the raphe valve showing the raised sternum and interstriae. Fig. 25. External view of a raphe valve showing de enlarged central pores and the deflected terminal fissures. Scale bar: 2 µm (Figs. 23–25).