FIG. 5 in Analysis of the type material of Synedra deformis W.Sm. and Synedra vaucheriae var. deformis Grunow (Fragilariaceae, Bacillariophyta)

FIG. 5. — Fragilaria pectinalis (O.F.Müll.) Lyngb. Images taken from the River Aa, province of Antwerp, Belgium: A-S, LM views of more or less normally formed valves of the population arranged in decreasing length; T, U, LM views of two frustules connected in girdle view; V-AJ, LM views of several deformed valves of the population arranged in decreasing length; AK, SEM external view of a frustule in oblique view showing the girdle bands and the mantle plaques; AL, SEM external view of an entire valve; AM, SEM external detail of a valve apex with the rimoportula; AN, SEM external detail of a valve apex lacking the rimoportula. Note the spines and small granules at the valve margin; AO, SEM internal view of an entire valve showing the slightly eccentric position of the rimoportula at one apex. Scale bars: A-AL, AN, 10 µm; AM, AO, 1 µm.