Glossary terms starting with "d"

Distal raphe

The portion of a raphe branch that is near the valve end, or valve apex. See also proximal raphe.

Dorsal

The side of the valve that is wider and more convex than the ventral side. Occurs in genera that are asymmetrical to the apical axis, such as Cymbella and Encyonema. From Latin for back of the body.