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.
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4-5) has a plate pattern of four apical, two apical intercalary and seven precingular plates in the epitheca, there is an apical pore covered by a cover plate and surrounded by a pore plate, and a canal plate runs ventrally to the apex of the 1' plate (Figs.
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.
Most species the sulcus enters the epitheca and spreads to the antapex; 3' and 4" plates may be in conjunctum, contactum or remotum positions.
verna, Cordulegaster erronea*, Coryphaeschna ingens*, Dromogomphus spinosus, Epiaeschna heroes, Epitheca cynosura, E.
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.
obscurus were similar to those of Ladona deplanata, Epitheca sp.