Abstract
A detailed ultrastructural description of oogenesis is presented for the articulate brachiopodTerebratulina retusa (Linnaeus), based on collections made between October 1985 and October 1986 from the Firth of Lorn, west coast of Scotland. Oogenesis has been divided into six stages, defined according to ultrastructural changes, which are thought to be important steps in the process of vitellogenesis. Special attention has been given to the possible mechanisms involved in the acquisition and assimilation of nutrients within the differentiating oocyte. Each vitellogenic oocyte is contained within a follicular envelope which is attached to a genital lamella. As maturation proceeds, accessory cells proliferate within the follicular envelope. A variety of intra-accessory cell and oocyte/accessory cell communications were identified. The process of elaboration of the oolemma is reported in detail. Lipid was identified as the major nutrient reserve of the oocyte. Late mature oocytes measure ~130 µm in diameter when spawned. The process of oosorption is also documented.
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Communicated by J. Mauchline, Oban
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James, M.A., Ansell, A.D. & Curry, G.B. Oogenesis in the articulate brachiopodTerebratulina retusa . Mar. Biol. 111, 411–423 (1991). https://doi.org/10.1007/BF01319413
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DOI: https://doi.org/10.1007/BF01319413