FIGURES 5–10 in A new species of nanoplanktonic diatom: Thalassiosira catharinensis (Bacillariophyceae) from Southern of Brazil

FIGURES 5–10. Thalassiosira catharinensis. SEM, external views. Rimoportula and fultoportulae are indicated with white arrows. 5. Frustule in external view showing part of the internal view at right hand side. Note the valvocopula with a row of pores at the advalvar edge (*) and areolae with external foramina. The small and shallow internal rimoportula opening is indicated by a black arrow. 6. External view of a frustule showing short external fultoportulae tubes (black arrows). Note the fultoportulae and rimoportula tubes openings in different directions (white arrow). 7. Another valve showing fultoportulae and rimoportula external tubes located next to each other and at the same level. 8. Valve showing fultoportulae and rimoportula tubes openings in distinct directions and a valvocopula with a row of pores at the advalvar edge (*). 9. Valve partially covered by mucilage showing fultoportulae and rimoportula external tubes located next to each other and at the same level. 10. Part of a valve showing fultoportulae and rimoportula tubes openings in different directions. Scale bars: 1 μm.