FIGURES 21–27 in Cocconeis kurakakea, a new diatom species from Nukutavake (Tuamotu Archipelago, South Pacific): description and comparison with C. diruptoides and C. pseudodiruptoides

FIGURES 21–27. SEM micrographs of Cocconeis kurakakea: the type population on Nukutavake (sample NTV A1), SV internal views. Fig. 21. Entire SV with SV sternum thickenings and decussate areola pattern with oblong foramina. Fig. 22. SV valvocopula (SVVC) partially detached (arrow). Fig. 23. Open SVVC without fimbriae (arrow). Fig. 24. Apex with the SVVC irregular edge lying on the virgae (arrow). Fig. 25. SV margin with sort of funnel (arrow) opening by pores (arrowhead). Fig. 26. Areolae, internal oblong foramina (arrow), and hymenes located on the valve face (arrowhead). Fig. 27. SVVC open (arrowheads). Scale bars = 3 μm (22–23) 2 μm (21), 700 nm (27), 600 nm (24), 400 nm (25), 300 nm (26).