FIGURES 33–41. Chaetoceros rostratus. Figs 33, 38–41 in The planktonic diatom genus Chaetoceros Ehrenberg (Bacillariophyta) from the Adriatic Sea

FIGURES 33–41. Chaetoceros rostratus. Figs 33, 38–41: culture material, strain PMFR4. Figs 34–37: field material. Figs 33–35: LM. Figs 36–38: SEM. Figs 39–41: TEM. 33) A chain. 34) Terminal part of a chain. Note the absence of the linking spine in the terminal valve (arrow). 35) Two intercalary cells showing the presence of chloroplasts in cell body and setae. 36) Intercalary sibling valves connected with the linking spine and visible tube-like processes of rimoportulae (arrows). 37) Internal view of the intercalary valve showing the conical hole of the linking spine and the slit-like eccentric rimoportula (arrow). 38) Detail of a seta. 39) External view of the terminal valve showing the small tube-like eccentric process (arrow) and the fine structure of the valve face, mantle and bases of the setae. 40) Detail of a seta showing the ornamentation of the side wall with larger poroids on either side of the poroid rows (arrows). 41) Tetragonal cross section of the seta. Scale bars: 33, 34=20 μm; 35=10 μm; 36, 37=5 μm; 39 = 2 μm; 38, 40, 41=1 μm.