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Diagnostic features

Valves differ from each other (only one has a raphe; i.e. the genus is monoraphid). Valves arched in girdle view. Raphid valve usually has a band of thickened silica running across its centre. The pictured species (A. inflata) often forms short chains.

Typical habitats

Lakes and slow flowing streams/rivers


Kingdom Chromista
Phylum Ochrophyta
Class Bacillariophyceae
Order Achnanthales
Family Achnanthaceae
Common name Diatoms