FIGURES 21–26 in A new species of Gomphonema (Bacillariophyta) from Xingkai Lake, China

FIGURES 21–26. Gomphonema subinsigniforme sp. nov. SEM, internal views. Fig. 21. Interior view of entire valve. Fig. 22. Detail of central nodule, showing curvature of proximal raphe end (black arrow) and slit-like stigmal opening (white arrow). Fig. 23. Detail of helictoglossa, offset from raphe branch (white arrow) and pseudoseptum at footpole (black arrow). Fig. 24. Detail of helictoglossa (black arrow) and pseudoseptum at headpole (white arrow). Figs 25, 26. Detail of areolae within deep troughs. Scale bars =5μm (Fig. 21), 2μm (Figs 22–24), 0.5μm (Figs 25–26).