Oogenesis in the Polychaete Dipolydora commensalis

Oogenesis in the Polychaete Dipolydora commensalis Oocytes of the polychaete Dipolydora commensalis develop in the gonad, in close contact with the wall of the genital blood vessel, up to the late stages of vitellogenesis. At the blood vessel wall, between the neighboring vitellogenic oocytes, and sometimes on the apical surface of the oocytes, there are flattened follicular cells. However, no continuous, well-expressed gonad envelope is found. Oogenesis is asynchronous. Gametes at all developmental stages, from oogonia to late vitellogenic oocytes, occur in the gonad. Dividing oogonia vary from 6 to 10 μm in diameter. RNA, proteins, glycogen, and lipids accumulate in the oocytes during vitellogenesis. The breakdown of the oocyte germ vesicle occurs in the gonad. Before spawning, gametes accumulate in the coelom and reach 80–90 μm in diameter, at which point a new generation appears in the gonad. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Oogenesis in the Polychaete Dipolydora commensalis

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Kluwer Academic Publishers-Plenum Publishers
Copyright © 2000 by MAIK “Nauka/Interperiodica”
Life Sciences; Freshwater & Marine Ecology
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