Tabellaria flocculosa (Tabellariaceae)
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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.