FIGURES 61–64 in Comparison of two new species of Mastogloia (Bacillariophyceae) with other small members of section Ellipticae

FIGURES 61–64. Mastogloia ovulum, SEM, type material (BRM-AS40, Miang Besar, Borneo) in the Hustedt collection at Bremerhaven. (61) External view of valve showing sinuous raphe branches and apically elongated areolae; (62) External view of apex showing apically elongated areolae and distal raphe ending with no terminal fissure; (63) Internal valve view showing bilobed partecta (arrowhead) up to the apex; (64) Internal view of apex showing partecta with linear rows of fine pores.