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Diagnostic features

Valves identical, each possessing a raphe (i.e. the genus is biraphid).  Frustules ovoid in valve view; the ends are bluntly rounded. There is a prominent longitudinal centre line, interrupted by an empty central area. The valve is heavily ribbed.

Typical habitats

River and lake habitats, typically in low abundance


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