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plural epithecae
(microbiology, planktology) The upper half of the theca of a thecate protist such as a diatom or dinoflagellate. quotations
Cellariiform, the orifices nearly confined to the convex frontal and lateral surfaces; the basal surface with a strong median calcareous keel, almost concealed by a flat membranous epitheca, which covers the whole zoarium […]
1957, Sidney Frederic Harmer, The Polyzoa of the Siboga Expedition, page 1106