FIGURES 9–15 in A re-investigation of three Frenguelli's Caloneis taxa (Pinnulariaceae, Bacillariophyta) from Argentina

FIGURES 9–15. Caloneis mendosina Frenguelli (emend. Sar & Sunesen) from unmounted syntype material of C. mendosina and C. mendosina var. minor. SEM. Arrowheads show the internal aperture of the alveolate areolae. Fig. 9. Small tilted frustule showing broad fascia, radiate striae and deep mantle shallower near the apices. Fig. 10. Frustule in girdle view. Note girdle bands are missing. Fig. 11. Frustule tilted showing the valve view of the hypovalve. Fig. 12. Frustule tilted showing the epivalve. Note valve surface curved proximal region and vertical distal unperforated region of the mantle. Internal elliptical apertures are located at the junction of the valve face and mantle (arrowheads). Fig. 13. Frustule in girdle view. Note alveolate striae continuing shortly onto the valve mantle. Fig. 14. Frustule tilted showing the hypovalve and the mantle of the epivalve. Note excavated raphe fissures bent toward the margin of the valve in the same direction with terminal raphe fissure. Fig. 15. Detail of the polar region of a frustule in girdle view showing terminal raphe fissure finished near the valve margin (arrows). Scale bar: 10 μm in Figs 9–14; 5 μm in Fig. 15.