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首页> 外文期刊>Zoological Science >Studies on the structure of the brooding organs of two botryllidascidians, Botryllus delicatus and Botryllus sexiens
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Studies on the structure of the brooding organs of two botryllidascidians, Botryllus delicatus and Botryllus sexiens

机译：两种灰霉病菌Botryllus delicatus和Botryllus sexiens的孵化器官的结构研究

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摘要

The formative processes of the brooding organs of two botryllid ascidians, Botryllus delicatus and Botryllus sexlens, were observed. The structure of these organs was also studied in detail histologically. The brooding organs of these two species were formed from the branchial sac, in contrast to the brooding organs of other botryllids, which are formed from the peribranchial wall. The structures of the brooding organs of B. delicatus and B. sexiens were different, but the processes of their formation were almost the same. As the maturation of the oocytes occurred, a part of the epithelium of the branchial sac extended toward the peribranchial epithelium covering the ovary. The extension of the branchial epithelium looked like a bowl and made a surrounding space with the peribranchial epithelium in a peribranchial cavity. The oocyte was ovulated into this space and fertilized there. After ovulation, the extension of the branchial epithelium formed a sac-like brooding organ in combination with the peribranchial wall and held the embryo tightly, like the incubatory pouch of the genus Botrylloides. The unusual characteristics of the brooding organs in these two species lead to reconsideration of phylogenetic relationships and taxonomic criteria in botryllids.
机译：观察到两个灰霉病海藻，Botryllus delicatus和Botryllus sexlens的孵化器官的形成过程。对这些器官的结构也进行了组织学详细研究。这两个物种的育雏器官是由the囊形成的，而其他芽孢杆菌的育雏器官则是由支气管周壁形成的。 B. delicatus和B. sexiens的育雏器官的结构不同，但是它们的形成过程几乎相同。随着卵母细胞的成熟，分支囊的上皮部分向覆盖卵巢的支气管周上皮延伸。分支上皮的延伸看起来像碗状，并在分支周围腔中与分支周围上皮形成周围空间。将卵母细胞排卵到该空间并在那里受精。排卵后，the上皮的延伸与支气管周壁结合形成囊状的育雏器官，并像胚芽孢杆菌属的温育袋一样紧紧地固定着胚胎。这两个物种中育雏器官的异常特征导致人们重新考虑了葡萄孢的系统发育关系和分类标准。

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