FIGURES 183–194. Chaetoceros vixvisibilis field material. Figs 183–185, 191–192 in The planktonic diatom genus Chaetoceros Ehrenberg (Bacillariophyta) from the Adriatic Sea

FIGURES 183–194. Chaetoceros vixvisibilis field material. Figs 183–185, 191–192: LM. Figs 186–189, 193: TEM. Figs 190, 194: SEM. 183) Middle part of a chain with broken setae. 184, 185) Intercalary cells with the narrow aperture. 186) Intercalary valve showing valve ornamentation with central annulus and ends of costae twisted in small spirals. 187) Detail of terminal valve with central annulus and rimoportula. 188) Detail of the girdle. 189, 190) Details of setae, note the absence of spines. 191, 192) Resting spores within parent cells with different number of dichotomously branched spines. 193) Resting spore with two branched spines. 194) Open resting spore, secondary valve has a single ring of puncta on the advalvar margin (arrow). Scale bars: 183=20 μm, 184–185, 191–192=10 μm; 186, 193–194=2 μm; 187–190=1 μm.