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Indagine ultrastrutturale sugli ovositi maturi di Chondrilla nucula Schmidt (Porifera, Demospongiae) = An ultrastructural analysis on the mature oocytes of Chondrilla nucula Schmidt (Porifera, Demospongiae)
Gaino, E. (1980). Indagine ultrastrutturale sugli ovositi maturi di Chondrilla nucula Schmidt (Porifera, Demospongiae) = An ultrastructural analysis on the mature oocytes of Chondrilla nucula Schmidt (Porifera, Demospongiae). Cah. Biol. Mar. 21(1): 11-22
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
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Keyword
    Marine

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  • Gaino, E.

Abstract
    The morphology of the mature oocyte of C. nucula observed by electron microscopy has been described. Neither feeding cells nor a follicular envelope surround the mature oocyte, which is located among collagenous fibrils. Although the general morphology of this oocyte is close to that of other Demospongiae, some peculiarities can be remarked: presence of yolk inclusa and lipidic zones inside the pseudopodia; generally radial pattern of pseudopodia which look different in mophology and dimensions around the oocytes; vacuolation of cytoplasm and final variation of the oocyte that could be interpreted as a preparation to spawning. These observations have been discussed and compared with previous ultrastructural studies on the oocytes of other Demospongiae.

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