Araphid
Staurosira
- Striae narrow, composed of small, round or somewhat elongated areolae
- Striae do not meet in central sternum
Staurosira valves are elliptic or cruciform in outline. In girdle view, the frustules are rectangular in shape. Cells often form colonies, joined by interlinking spines. The striae are narrow and composed of small, round areolae. Note that, for most species, the areolae are only visible in SEM. Striae do not meet one another in the...