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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.

Typical habitats

Stony and muddy habitats, including nutrient enriched sites


Kingdom Chromista
Phylum Ochrophyta
Class Bacillariophyceae
Order Naviculales
Family Pleurosigmataceae
Common name Diatoms