FIGURES 47–52 in Pinnularia baetica sp. nov. (Bacillarophyceae): Comparison with other panduriform species in the Mediterranean area

FIGURES 47–52. Pinnularia baetica sp. nov. Scanning electron micrographs of the type population sampled in Laguna Seca. (47) external valvar view; (48) internal valvar view; (49) external view of the apex, showing the distal raphe hooked endings; (50) internal view of the apex, showing the distal raphe endings terminating on small helictoglossae; (51) external central nodule bent on one side; (52) rows of each alveoli. Scale bars 5 μm (47–49,51); 1 μm (50,52).