Hannaea inaequidentata, middle details of pre-normal cells, external view, SEM 113 middle part of Fig. 107 showing deflexed sternum (two arrows) and central area 114 detail of middle illustrated in Fig. 108 showing sternum (two arrows) and central area 115 detail of middle illustrated in Fig. 109 showing sternum (two arrows) and central area 116 detail of middle part illustrated in Fig. 110 showing developed virgae and vimines 117 detail of middle part illustrated in Fig. 111 showing developed spines 118 detail of middle part illustrated in Fig. 112 showing well-developed virgae, vimines and spines. Scale bars: 5 μm (113–118).