FIGURES 19–23 in A New Aerophilic Neidium Pfister (Neidiaceae, Bacillariophyta) species from Guangxi Zhuang Autonomous Region, China

FIGURES 19–23. Neidium convolutum Liu & Kociolek sp. nov. SEM, internal view. Fig. 19: Whole valve; Fig. 20: Valve apex, helictoglossae on the valve face (white arrow); Fig. 21: Valve apex, raised helictoglossae (white arrow) and renilimbi along the axial area (black arrow); Fig. 22: Proximal raphe ends fused to an elongated structure, raised upon the valve (white arrow), renilimbi along the axial area (black arrow); Fig. 23: Magnification of internal opening of areolae with hymenes, the opening of areolae on the longitudinal canal are elongated (white arrow), renilimbi along the longitudinal canal (black arrow).