coeloblastula


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coeloblastula

 [se″lo-blas´tu-lah]
the common type of blastula, consisting of a hollow sphere composed of blastomeres.

coeloblastula

/coe·lo·blas·tu·la/ (se″lo-blas´tu-lah) the common type of blastula, consisting of a hollow sphere composed of blastomeres.
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Owenia collaris embryos undergo holoblastic spiral cleavage to form a coeloblastula, which, although exceptionally hollow (again like some nemerteans), conforms to the ancestral pattern for annelids (Okada, 1970).
A coeloblastula is usually formed with the blastomeres comprising a single layered epithelium enclosing a large blastocoele (Nyholm, 1949; Mergner, 1971; Campbell, 1974; Spaulding, 1974; Fautin et al.
The blastomcres became ever smaller due to repeated cleavage, and after 8 h, a coeloblastula consisting of many cells and one cell layer was formed (Figs.
The zygote then undergoes radial, holoblastic cleavage and forms a hollow coeloblastula.
Although the coeloblastula is a major type of sponge larva, our knowledge about its development is scanty.
The even, asynchronous cleavage results in a coeloblastula, which transforms into a disphaerula larva (Ereskovsky and Gonobobleva, 1999), with a diameter between 120 and 150 [micro]m (Fig.
In Demospongiae, several authors have suggested that the coeloblastula or parenchymella larvae express an existing polarity in their attachment to the substrate.