FIGURES 22–26 in Oricymba rhynchocephala sp. nov., a new cymbelloid diatom (Bacillariophyceae) from Xianju National Park in Zhejiang Province, China

FIGURES 22–26. Oricymba rhynchocephala, SEM, internal views. 22. Entire valve with raphe slit evident down the center and a helictoglossa at each apex. 23. Valve centre showing two internal stigma openings each occluded with small, tooth-like projections and small, relatively undifferentiated central nodule without an intermissio. 24. Striae formed by slit-like, elongate areolae separated by robust silica ribs. 25–26. Views of the apices with helictoglossae and apical pore fields evident. Scale bars = 10 μm (Fig. 22) and 2 μm (Figs 23–24) and 5 μm (Figs 25–26).