hypotheca


Also found in: Dictionary, Wikipedia.

hypotheca

[¦hī·pō′thē·kə]
(invertebrate zoology)
The lower valve of a diatom frustule.
Covering on the hypocone in dinoflagellates.
Mentioned in ?
References in periodicals archive ?
A specimen 640 [micron]m long and 20 [micron]m wide, with a gradually tapering hypotheca ending with a thin theca with an acute end without spines, presumably belonging to A.
Freshwater dinoflagellate, small, ovoid topentagonalcell, plates thin, plate pattern: apical pore, pote plate, canal plate, 4', 2a, 7", C6, S5, 5"', 2"", most photosynthetic with yellow-gold plastids, cingulum is wide, sub-median and the hypotheca is smaller than the epitheca.
His training for the priesthood was conducted in antiquated language and concepts - wanting to impress his friend Baillie he listed his present occupation as: 'Emphyteusis, laud-emium, mohatra, antichresis, hypotheca, servitus activa et passiva.'
6.2.9.4; si priori hypotheca obligata sit, nihil vero de venditione convenerit, posterior vero de hypotheca vendenda convenerit, verius est priorem potiorem esse ...: Marcian.
Cells are subovate, egg-shaped, sometimes almost triangular, with a broadly rounded epitheca and narrowly tapered hypotheca terminating with a strong triangular spine, somewhat deflected ventrally.
Other features such as the areolation of the hypotheca wall are characteristic of only a few taxa (i.e.
Peridinium quinquecorne Abe is a marine thecate dinoflagellate that bears four characteristic thick spines on the hypotheca (Abe, 1927; Horiguchi & Pienaar, 1991).
The abbreviations for cell measurements are as follows: L--total length measured from the furthest part of the hypotheca including the antapical horns; Wb--cell body width measured in ventral or dorsal view just in front of or behind the cingulum, not considering the precingular or postcingular membranes (the only measured width in the species with straight or slightly curved antapical horns directed backward; always measured using the 40x objective to avoid a large error); Wt--total width, considering the distance between external sides of the antapical horns directed laterally, forward or laterally-forward.