FIGURES 154–161 in The planktonic diatom genus Chaetoceros Ehrenberg (Bacillariophyta) from the Adriatic Sea

FIGURES 154–161. Chaetoceros messanensis, Chaetoceros protuberans, Chaetoceros pseudocurvisetus. Figs 154–157, 160–161: LM. Figs 158–159: SEM. Figs 154–155: Chaetoceros messanensis field material. 154) Complete chain with special forked intercalary setae. 155) Terminal part of the chain showing wide, hexagonal apertures and different orientation of the two terminal setae. Figs 156– 159: Chaetoceros protuberans field material. 156) Terminal part of a chain. 157) Sibling valves. 158) Sibling valves, note the poroids perforating the valve surface. 159) Detail of a seta. Figs 160–161: Chaetoceros pseudocurvisetus field material. 160) Middle part of the chain showing orientation of the setae. 161) Intercalary cells showing the short distinctive aperture (arrow). Scale bars: 154–156, 160=20 μm; 157, 161=10 μm; 158=5 μm; 159=0.5 μm.