Definitions for "Epitheca"
the upper or large half of the frustule of a diatom, or the plates above the cingulum in peridinian dinoflagellates.
larger valve of a diatom cell wall (frustule)
The upper part of a diatom, consisting of the epivalve and part of the girdle (a cingulum).
A continuous and, usually, structureless layer which covers more or less of the exterior of many corals.
The cuticular exterior layer of the frontal wall in cheilostomes.