Hannaea inaequidentata, an initial frustule, external view, SEM 91 complete initial frustule, note its rounded outline 92 detail of Fig. 90, showing longitudinal perizonium wholly covering valve surface, no transverse perizonium bands (arrows) 93 detail of Fig. 90 showing longitudinal perizonium (arrows) 94 detail of Fig. 91 showing longitudinal perizonium on two valves and one girdle band (arrows) 95, 96 two apex details of Fig. 91 showing longitudinal perizonium (arrows), irregular ocellulimbus, and two rimoportulae per valve (curved arrows). Scale bars: 20 μm (91), 1 μm (92–96).

 
 
  Part of: Liu B, Williams DM (2020) From chaos to order: the life history of Hannaea inaequidentata (Lagerstedt) Genkal and Kharitonov (Bacillariophyta), from initial cells to vegetative cells. PhytoKeys 162: 81-112. https://doi.org/10.3897/phytokeys.162.56136