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The frustules structure is usually composed of two overlapping sections, known as valves. The upper valve is termed the epitheca and is slightly larger and overlaps the lower valve, the hypotheca.
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epitheca
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Epitheca — Ep i*the ca, n. [NL., fr. Gr. epi upon + ? a case, box, fr. ? to place.] (Zo[ o]l.) A continuous and, usually, structureless layer which covers more or less of the exterior of many corals. [1913 Webster] … The Collaborative International Dictionary of English
Epitheca bimaculata — Epitheca bimaculata … Wikipédia en Français
Epitheca bimaculata — Zweifleck Zweifleck (Epitheca bimaculata) Systematik Ordnung: Großlibellen (Anisoptera) … Deutsch Wikipedia
epitheca — n. [Gr. epi, upon; theke, case] (CNIDARIA) The external layer surrounding the theca in many corals … Dictionary of invertebrate zoology
epitheca — (ep ī the kah) The larger of two halves of a diatom frustule (shell) … Dictionary of microbiology
epitheca — epi·theca … English syllables
epitheca — … Useful english dictionary
Zweiflecke — Zweifleck (Epitheca bimaculata), kurz nach der Imaginalhäutung Systematik Unterklasse: Fluginsekten (Pterygota) … Deutsch Wikipedia
Zweiflecklibelle — Zweifleck Zweifleck (Epitheca bimaculata) Systematik Ordnung: Großlibellen (Anisoptera) … Deutsch Wikipedia
Common Baskettail — male Scientific classification Kingdom: Animalia … Wikipedia
