FIGURE 16–20. Sceptronema orientale. SEM. Sample LPC 11650. Figs 16–17 in The epizoic marine diatom Sceptronema orientale (Licmophoraceae, Licmophorales): epitypification and emendation of specific and generic descriptions

FIGURE 16–20. Sceptronema orientale. SEM. Sample LPC 11650. Figs 16–17. Internal valve view. Note open bands in Fig. 16 (VC valvocopula, CP 1 1st copula). Figs 18–20. External views. Fig. 18. Valve mantle of the head-pole with an apical slit field and girdle. Arrowheads show sunken cross bars of the slits (VC valvocopula, CP 1 1st copula, CP 2 2nd copula). Fig. 19. Foot-pole of a valve showing rimoportulae opening by subcircular to elliptical pores (arrowheads). Fig. 20. Central part of valve showing straight sternum and transverse, uniseriate striae. Scale bars: Figs 16–17 = 5 µm; Fig. 19 = 2 µm; Figs 18, 20 = 1 µm.