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Diagnostic features

Valves identical, each possessing a raphe (genus is biraphid). Smaller than Gomphoneis. Valves asymmetric, with one pointed end and the other end bluntly rounded (club-shaped valve), lobed (violin-shaped valve), or pointed (but still slightly asymmetric; may be subtle).  Wedge-shaped in girdle view. Attached to surfaces (including other algae) by short mucilaginous stalks.

Typical habitats

All sorts of streams and rivers


Kingdom Chromista
Phylum Ochrophyta
Class Bacillariophyceae
Order Cymbellales
Family Gomphonemataceae
Common name Diatoms