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- Semi-rectangular
- Rotational symmetry of cell face outline 180 degrees, with the ends being opposite reflections of each other
Gyrosigma (Pleurosigmataceae)
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Diagnostic features
Valves identical, each possessing a raphe (genus is biraphid). Sigmoid or propeller-shaped in valve view (raphe also sigmoid) and boat-shaped in girdle view. Striae form rows in both perpendicular and parallel directions with respect to the long axis of the cell. Chloroplasts golden-brown.