- Rotational symmetry of cell face outline 180 degrees, one end is a reflection of the other
- Raphe absent
Tabellaria flocculosa (Tabellariaceae)
In this section
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.