Glossary
Like the rest of this website, the glossary is a work in progress. If we’ve missed a term, please contact us to let us know the term and references.
Convergent
Convergent refers to striae that lean toward the central nodule, with the sternum as the origin. Convergent striae may occur throughout the valve, at the valve center, or at the valve apices. In contrast, striae are radiate, or divergent, when they lean away from the central nodule, with the sternum as the origin.
Image Credit: Sarah Spaulding
Image Credit: Marina Potapova
Image Credit: Sarah Spaulding
The striae at the ends of Pinnularia sp. are convergent.
Image Credit: Marina Potapova
The striae at the ends of Navicula angusta are convergent, while the striae are radiate near the center of the valve.