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Diagnostic features

Very small and lightly silicified. Valves are identical, each possessing a raphe in a distinct central sternum (genus is biraphid). Striae too small to be seen with a light microscope. May not appear like a diatom in shape without close inspection (in which the sternum may be spotted). Chloroplasts golden-brown.

Typical habitats

Can reach high abundance in eutrophic and polluted waters.


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