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Diagnostic features

Pennate diatom, rectangular in girdle view (most commonly seen), connected by the corners to form zigzag chains. Narrow and elongated in valve view, with a pronounced swelling in the middle and a smaller swelling at the ends. Valves identical, neither containing a raphe (genus is araphid).  Chloroplasts golden brown.

Typical habitats

Wide range of slow-flowing or stagnant habitats


Kingdom Chromista
Phylum Ochrophyta
Class Bacillariophyceae
Order Tabellariales
Family Tabellariaceae
Common name Diatoms