Figures 5 from: Yu P, You Q, Pang W, Wang Q (2022) Two new freshwater species of the genus Achnanthidium (Bacillariophyta, Achnanthidiaceae) from Qingxi River, China. PhytoKeys 192: 11-28. https://doi.org/10.3897/phytokeys.191.78489

Figures 5 A–FAchnanthidium anhuense sp. nov., SEM internal views of rapheless valve A, B internal view of an entire rapheless valve C, D apices of the valve E central area of the valve F internal areola openings with fine hymenate structures. Scale bars: 5 µm (A, B); 1 µm (E); 0.5 µm (C, D, F).