Panduriform

Panduriform refers to the shape of a valve which is concave on each side, similar to the body of a violin.

Alternative Terms

Obovate

Obovate means inversely ovate, or narrow toward the central area and wider toward the apices.

Playaensis Circumfimbria1
Image Credit: S. Spaulding
The shape of Playaensis circumfibula is panduriform.
Oxbinalis 4
Oxyneis binalis has a panduriform valve margin.