perisarc


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Related to perisarc: Coenosarc

perisarc

[′per·ə‚särk]
(invertebrate zoology)
The outer integument of a hydroid.
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References in periodicals archive ?
Hydrothecae of moderately thin perisarc, campanulated, urn-shaped, 587-976 pro long, 95-137 [micron]m wide at diaphragm, 229-399 pro wide at margin; convex walls above diaphragm, nearly straight elsewhere.
Pedicels very long, about 18-20 mm, thick perisarc, with 3-4 occasional groups of annuli irregularly placed along length; groups with 3-7 annuli; distal end of pedicel with slight swelling just beneath a sub-hydrothecal spherule.
Description: Stolonal or erect colonies, with brownish and thick perisarc.
Pedicels with thick perisarc, strong, straight or slightly sinuous, relatively short, 1.
Inside the perisarc is a hollow tube of soft tissue composed of two cell layers separated by an extracellular matrix, the mesogloea.
In thecates, the polyp expands out of the tubelike endings of the perisarc covering (Fig.
The perisarc of the stolons is an almost uniform tube that is flattened at the site of tight contact to the substratum.
Hence, the pattern of the perisarc emerges exclusively at that site.
The surface at this stage is smooth and covered with perisarc material.
The surface of the immature polyp below the region of the head is covered with perisarc.
A mouth is present at the very tip of the hypostome just above the whorl of capitate tentacles, a perisarc covers the stalk and basal region of the polyp, and stolon formation has begun in the basal region of the polyp [ILLUSTRATION FOR FIGURE 8 OMITTED].
On either side of the basal disc just above the substrate attachment zone, the perisarc is connected to the basal disc and lower body column.