企鹅珍珠贝生殖细胞的发生

对不同发育阶段的企鹅珍珠贝[Ptedapenguin(Rding)]的性腺结构、生殖细胞结构与分布进行组织学观察,描述精/卵子发生过程中各级精/卵细胞的特征。结果表明:根据雌性生殖细胞形态和卵黄的变化特点,卵子发生经历卵原细胞、无卵黄初级卵母细胞、卵黄形成期卵母细胞及成熟卵子阶段;依据雄性生殖细胞大小和细胞核形态变化,精子发生经历精原细胞、初级精母细胞、次级精母细胞、精子细胞和精子阶段,其中精原细胞存在形态上有差异的A型和B型两种类型。此外还观察到企鹅珍珠贝的性别转化现象。

Gametogenesis in Pteria penguin(R(o)ding)(Moilusca,Bvalvia)

The gonad and gametocyte of Pteda (Magnavicula) penguin (Rding) were observed under microscope with the method of historical section, and the morphology and the distribution of oogametes and spermatogonia at different development stages were described. The results showed that the germ cells in the scallop could be divided into several stages. Female germ cells could be divided into oogonium, yolkless vitellogenisis stage, yolk-fomation vitellogenesis stage, mature oocyte srage, and degenerate oocyte stage, and male germ cells into spermatogonium stage, primary spermatocyte stage, secondary spermatocyte stage, spermatid stage and spermatozoan stage. Moreover, the spermatogonium were divided into A and B style. Furthermore, a sex reversal specimen was discovered.