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首页> 美国卫生研究院文献>Heliyon >Gonadal sex differentiation and development during early ontogenesis in the breeding kisslip cuttlefish (Sepia lycidas)
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Gonadal sex differentiation and development during early ontogenesis in the breeding kisslip cuttlefish (Sepia lycidas)

机译：繁殖吻唇墨鱼（Sepia lycidas）在早期本体发育期间的性腺性别分化和发育。

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摘要

To understand and obtain basic information on sex differentiation in the kisslip cuttlefish (Sepia lycidas), the gonadal sex differentiation process was investigated histologically. An undifferentiated gonad consisting of germ cells and somatic cells was found to form at a caudal site in the space between the internal yolk sacks of cuttlefish embryos at 14 and 21 days after spawning (DAS). Sexual dimorphism in the gonad was first detected at around 28 DAS. Meiotic oocytes were observed as the first visible morphological characteristic of ovaries in the gonads of some cuttlefish embryos at 28 DAS. In other individuals, neither meiotic germ cells, nor the appearance of a testicular structure, were observed in the gonad even after 10 days post hatching (DPH). Seminiferous tubules, consisting of a small number of spermatogonia and a surrounding basement membrane, were the first visible morphological characteristic of the testis in the male gonad, detected at around 20 DPH. This is the third report on the gonadal sex differentiation process in cephalopods.
机译：为了了解并获得有关吻唇墨鱼（Sepia lycidas）性别分化的基本信息，我们从组织学角度研究了性腺性别分化的过程。发现在产卵后第14天和第21天，在墨鱼胚胎内卵黄袋之间的尾部部位形成了由生殖细胞和体细胞组成的未分化性腺。在28个DAS左右首次检测到性腺中的性二态性。 28 DAS观察到减数分裂的卵母细胞是某些墨鱼胚胎性腺中卵巢的第一个可见形态特征。在其他个体中，即使在孵化后（DPH）10天后，在性腺中也未观察到减数分裂生殖细胞或睾丸结构的出现。由少量精原细胞和周围基底膜组成的曲细精管是雄性腺中睾丸的第一个可见形态特征，大约在20 DPH时被检测到。这是关于头足类的性腺性别分化过程的第三份报告。

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