Coeloblastula


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coeloblastula

[‚sē·lō′blas·chə·lə]
(embryology)
A simple, hollow blastula with a single-layered wall.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Coeloblastula

 

a stage of embryonic development; a type of blastula. The coeloblastula is characteristic of certain Coelenterata, lower Arthropoda, Echinodermata, Tunicata, Acrania, Cyclostomata, Acipenseridae, and most Amphibia. It is formed as a result of complete radial cleavage (even or uneven). It resembles a bubble filled with fluid.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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By the time a coeloblastula forms, most zooxanthellae are located in individual blastomeres, at one end of the coeloblastula.
Twenty hours after spawning, the motile coeloblastulas began to show a slight depression at the pole about which the algae were concentrated.
Early development and acquisition of zooxanthellae in the temperate symbiotic sea anemone Anthopleura ballii (cocks)
An amphiblastula or coeloblastula is produced by calcareous sponges; a parenchymella is the larva of the majority of demosponges, but several other larval types are known; and a trichimella is exclusive to hexactinellid sponges.
In this study we will show the fine structure of the coeloblastula, metamorphosing larva, and juvenile sponge of Leucosolenia laxa in clear electron micrographs.
The coeloblastula is a hollow spheroid consisting of a layer of flagellated cells around a large central cavity (Fig.
Figure 2 shows the flagellated cells of the coeloblastula of L.
Vesicular cells in the coeloblastula are also described for the first time.
Metamorphosis of Coeloblastula Performed by Multipotential Larval Flagellated Cells in the Calcareous Sponge Leucosolenia laxa

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