FIGURES 37–44 in Comparison of two new species of Mastogloia (Bacillariophyceae) with other small members of section Ellipticae

FIGURES 37–44. Mastogloia matthaei, SEM, type material (SEM stub DISVAR-ANS7SP46, Siladen, Indonesia). (37) External view of valve showing sinuous raphe branches and thickened longitudinal stria pattern (arrowhead); (38) External view of central region showing proximal raphe endings and quadrangular areolae; (39) External view of apex showing distal raphe ending with no terminal fissure; (40) Internal valve view showing bilobed partecta (arrowhead) up to the apex and longitudinal stria pattern; (41) Internal view of central region showing raised central nodule; (42) Internal view of valve showing partecta with linear rows of fine pores; (43) External view of tilted valve showing longitudinal stria pattern with no areolae on mantle; (44) External view of tilted valve showing partectal pores.