| During human fetal development, the primordial germ cells migrate to and are incorporated within the developing ovary and are termed oogonia. |
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| The germinal epithelium is composed of epithelial cells that become prefollicle cells when associated with oogonia, as in Fundulus grandis. |
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| In the case of developing eggs, the diploid oogonia continue to divide mitotically for a short time in the ovary. |
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| Meiosis occurs just before mating in well-differentiated oogonia and antheridia. |
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| The oogonia multiply by mitosis, but early in fetal life, they enter meiosis. |
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| The receptacles are reproductive branches and contain many cavities with external pores which contain antheridia and oogonia, then through meiosis, sperm and egg are produced. |
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| Further comparison might be made between the stalked and vase-shaped vesicles found on some fossil cells with the oogonia of certain living Vaucheria species. |
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| A number of oogonia appeared along the follicular walls and had a round nucleus containing a nucleolus in its center. |
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| The oocyte development process includes several stages of maturation, from the production of oogonia from primitive germ cells to development of primary oocytes and formation of definitive oocytes at puberty. |
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| Oogonia average 40 µm diameter, wall smooth, becoming yellowish with age. |
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| Oogonia and antheridia occur in conceptacles embedded in receptacles on special branches. |
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| Oogonia occurred in groups attached to the trabeculae and were usually surrounded by squamous-shaped follicular cells. |
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