Figs 20–27 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species

Figs 20–27. Angusticopula chilensis (Grunow) Houk et al. SEM. Campbell Island epitype population, sample BAS286. 20–22. SEM view of several valves in girdle view showing the ligulate, open, narrow girdle bands. The arrows indicate the ligulae in Fig. 20, the rimmed mantle edge in Fig. 21 and the fimbriate pars interior of the copulae in Fig. 22. 23. External view of a valve face. 24. External detail of the very fine striae and the small, rounded areolae. 25. Internal view of an entire valve showing the rimoportulae and the thick mantle. 26. External view of the mantle/valve face junction with several openings of the rimoportulae (arrows). 27. Internal detail of the valve mantle with some rimoportulae. Scale bars: 20–23, 25–26 = 10 μm; 24, 27 = 1 μm.