A–AD Holotype population of Luticola microcephala M. Rybak, Peszek & Kochman-Kędziora, sp. nov. A–V LM images of valve views W–AD SEM images W–X external view of valves Y external view of frustule girdle view Z partial valve view and girdle view of middle frustule section AA central area with several shallow depressions AB raphe structure with detailed view on distal raphe endings AC proximal raphe endings AD internal view of valve. Scale bars: 10 µm (A–Y), 5 µm (Z–AA), 4 µm (AB), 3 µm (AC, AD).