FIGURES 29–36 in Comparison of two new species of Mastogloia (Bacillariophyceae) with other small members of section Ellipticae

FIGURES 29–36. Mastogloia ovulum, SEM (DISVAR-ANS4SP32, Siladen, Indonesia). (29) External view of valve showing sinuous raphe branches; (30) External view of central region showing proximal raphe endings and apically elongated areolae; (31) External view of apex showing distal raphe ending with no terminal fissure; (32) Internal valve view showing bilobed partecta (arrowhead) up to the apex; (33) Internal view of central region showing raised central nodule; (34) Internal view of apex showing partecta with linear rows of fine pores; (35) External view of tilted specimen showing quincunx pattern of striae and no areolae on mantle (arrowhead); (36) External view of tilted valve showing partectal pores.