A–F Decussiphycus sinensis sp. nov. SEM, external view. Slide 09153 (from strain Ca68) A the entire valve; note the oppositely deflected distal raphe fissures B details of girdle bands structure; note the two rows of areolae (black arrowheads) C details of the central area; proximal raphe fissures expanded, slightly tilted to one side (white arrows) D, E details of the valve apex; note the distal raphe ends with silica folds (white arrowheads), areolae larger near the axial area (black arrows) and smaller towards the margin (white arrows), an isolated row of areolae (black arrowheads) F girdle bands; note the double rows of areolae with silica caps (black arrowheads). Scale bars: 10 µm (A, F); 0.5 µm (B); 2 µm (C–E).