hydrotheca


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Related to hydrotheca: perisarc

hydrotheca

[‚hī·drō′thē·kə]
(invertebrate zoology)
Cup-shaped portion of the perisarc in some cnidarians that serves to hold and protect a withdrawn hydranth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Hydrotheca campanulate, 350-740 [micro]m (n = 10) deep from rim to base, 215-340 [micro]m (n = 10) wide at margin, 100-180 [micro]m (n = 10) wide at diaphragm; diaphragm thin, transversal; operculum with 8-11 triangular to pentagonal valves (n = 10), apparently as folded continuation of hydrothecal wall, but with discrete line demarcating operculum from hydrotheca (only in SEM).
gracilis revealed the presence of a tenuous line separating the operculum from the hydrotheca (Fig.
One can see in the figures that the older colony elements are unaffected by the treatment: polyps stretch out of their hydrotheca, and they are able to catch their prey.