FIGURES 37–49 in A re-investigation of three Frenguelli's Caloneis taxa (Pinnulariaceae, Bacillariophyta) from Argentina

FIGURES 37–49. Caloneis mendosina Frenguelli (emend. Sar & Sunesen) from unmounted syntype material of C. quilinesis. SEM. External views. Arrowheads show terminal raphe fissures and arrows segmental copula. Figs 37–38. Same frustule in connective view and valvar view respectively. Fig. 39. Frustule showing the hypovalve and the epicingulum. Note vertical, unperforated region of the valve mantle of the epivalve, an open valvocopula and a segmental copula, m: mantle, v: valvocopula. Fig. 40. Valve in lateral view showing vertical, unperforated region of the valve mantle, shallower near the apices. Fig. 41. Frustule tilted similar to figure 39. Fig. 42. Frustule in girdle view. Note open valvocopula and segmental copula. Fig. 43. Detail of the figure 39 showing alveolae with outer areolate, multiseriate layer (3–4 poroids rows). Fig. 44. Detail of figure 32 showing central external raphe fissures dug out on the central area, ending in drop-like pores, deflected toward one side of the valve. Fig. 45. Detail of a central area showing alveolate striae of the hypovalve and valvocopula of the epicingulum with a row of elongate poroids. Figs 46–47. Detail of both apices of the valve in figure 39 showing the epicingulum, m: valve mantle, v: open valvocopula, and a segmental copula. Fig. 48. Detail of the polar area of a frustule in figure 41, note external terminal raphe fissure terminates close the valve margin (arrows). Fig. 49. Detail of a polar area of a valve in figure 40 showing the raphe fissure. Note alveolate striae continuing shortly onto the valve mantle. Scale bar: 10 μm in Figs 37–42; 5 μm in Figs 44–47; 2 μm in Figs 43, 48, 49.