epitheca


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epitheca

[¦ep·ə′thē·kə]
(invertebrate zoology)
An external, calcareous layer around the basal portion of the theca of many corals.
A protective covering of the epicone.
The outer portion of a diatom frustule.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The "head" is small, consisting of the epitheca and the cingulum, is positioned obliquely in relation to the longitudinal axis of the cell, looking anteriorly-upward.
Peridinium cinctum has a plate pattern of four apical, three apical intercalary and seven precingular plates in the epitheca, there is no apical pore, the 1' plate does not reach the apex, the 3' plate is topmost, the 2' plate is moderately sized, the 3' and 4' are large (Fig.
verna, Cordulegaster erronea*, Coryphaeschna ingens*, Dromogomphus spinosus, Epiaeschna heroes, Epitheca cynosura, E.
I evaluated the feeding biases of fish and dragonfly predators characteristic of each lake type in the laboratory: Aeshna mutata dragonflies from dragonfly lakes, and bluegill sunfish (Lepomis macrochirus) and Epitheca cynosura dragonflies from fish lakes.
Cells are large, cuneate, with low, broadly rounded epitheca, much narrower rounded posterior portion of the hypotheca, and nearly straight or slightly convex (sometimes slightly concave) sides of the hypotheca, with coarsely reticulate theca.
63) showed a relatively large epitheca, non-pedunculate anterior cingular list and an elongated margin that in some way resembled Ornithocercus.
umbrosa, Anax junius *, Epitheca princeps, Erythemis simplicicollis, Libellula luctuosa *, L.
For example, Kormondy & Gower (1965) found Epitheca cynosura to be semivoltine (bivoltine) in Pennsylvania, while Benke & Benke (1975) found the same species to be a univoltine spring species in South Carolina.
Fish mediated alternative life-history strategies in the dragonfly Epitheca cynosura.