OBSERVATIONS ON THE DEVELOPMENT AND SEX DIFFERENTIATION OF THE GONAD IN EMBRYOS AND YOUNG SPECIMENS OF SEPIA OFFICINALIS L.
OBSERVATIONS ON THE DEVELOPMENT AND SEX DIFFERENTIATION OF THE GONAD IN EMBRYOS AND YOUNG SPECIMENS OF SEPIA OFFICINALIS L.
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乌贼胚胎及幼体性腺发育及性别分化的观察。
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Foscarina De Grande
中科院分区：
文献类型：
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作者：
M. Grasso;Foscarina De Grande
作者通过对130个13 - 20期的胚胎和49个胚胎后4 - 10天的幼鱼标本的研究，研究了乌贼（Sepia officinalis）性腺和腺体的发育。根据他们的发现，性别分化发生在胚胎期，雌性性腺比雄性性腺生长得更快。由于雌性性腺的第一个原基仅在十八胚胎发育阶段出现，性腺的体积分化已经开始，因此这种雌性第二性特征是被认为是一种异性特征，还是像以前认为的那样是一种体性特征，还有待解决。
SUMMARY The authors investigated the development of the gonads and nidamental glands in cuttle-fish, Sepia officinalis, by examining 130 embryos ranging from the XIII to the XX Naef's stage and 49 young specimens from the fourth to the tenth postembryonic days. According to their findings, sex differentiation occurs during embryonic life as it is showed by the greater growth of the female than the male gonad. As the first primordia of the nidamental glands appear in females only at the XVIII embryonic developmental stage, after the volumetric differentiation of the gonad has begun, it remains to be solved whether this female secondary sexual characteristic is to be considered an eusexual character, or a somatosexual one as formerly supposed.