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Diagnostic features

Valves identical, both possessing a raphe (i.e. the genus is biraphid).  Frustules oval in valve view, less than 20µm in length (very small), although a range of lengths may occur.  Central area "bow tie" shaped. Chloroplasts golden brown, parietal, lying against the edges of the valve. May be difficult to distinguish from Sellaphora.

Typical habitats

The specimens photographed were from a lowland river


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