FIGURES 34–42. Odontidium andinum spec. nov. SEM. 34–37 in Odontidium andinum spec. nov. (Bacillariophyta) from Mendoza, Argentina

FIGURES 34–42. Odontidium andinum spec. nov. SEM. 34–37. Whole valves in internal view; note the presence of primary and secondary transapical ribs; the arrows in Fig. 37 show the valvocopular extensions of the pars interior gripping each transapical rib. 38. Detail of valve center. 39. Detail of the valvocopular extensions of the pars interior gripping each transapical ribs (arrows). 40. Detail of the valve end; note the internal opening of rimoportula and the sternum extended into the porefield. 41. Whole valve in internal oblique view, note the flat sternum. 42. Detail of valvocopula in internal view showing the valvocopular lobules attached to the virgae (arrowheads). Scale bars: 34–37, 41= 10 μm; 38–40, 42= 2 μm.