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首页> 外文期刊>Zoological Science >Ultrastructural Studies of the Formation of the Egg Capsule in the Hermaphroditic Species, Isohypsibius granulifer granulifer Thulin, 1928 (Eutardigrada: Hypsibiidae)
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Ultrastructural Studies of the Formation of the Egg Capsule in the Hermaphroditic Species, Isohypsibius granulifer granulifer Thulin, 1928 (Eutardigrada: Hypsibiidae)

机译：雌雄同体物种卵异卵菌中的卵囊形成的超微结构研究，1928年（Eutardigrada：Hypsibiidae）

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摘要

The egg capsule of Isohypsibius granulifer granulifer Thulin 1928 (Eutardigrada: Hypsibiidae) is composed of two shells: the thin vitelline envelope and the multilayered chorion. The process of the formation of the egg shell begins in middle vitellogenesis. The I. g. granulifer vitelline envelope is of the primary type (secreted by the oocyte), but the chorion should be regarded as a mixed type: primary (secreted by the oocyte), and secondary (produced by the cells of gonad wall). During early choriogenesis, the parts of the chorion are produced and then connected into a permanent layer. The completely developed chorion consists of three layers: (1) the inner, medium electron dense layer; (2) the middle labyrinthine layer; (3) the outer, medium electron dense layer. After the formation of the chorion, a vitelline envelope is secreted by the oocyte.
机译：Isohypsibius granulifer granulifer Thulin 1928（Eutardigrada：Hypsibiidae）的卵囊由两个壳组成：薄的卵黄膜外壳和多层绒毛膜。卵壳的形成过程始于中间卵黄发生。 I.g．肉芽肿卵黄膜包膜是主要类型（卵母细胞分泌），但绒毛膜应视为混合型：主要（卵母细胞分泌）和次生（绒毛壁细胞产生）。在早期绒毛形成过程中，绒毛膜的各个部分产生，然后连接成永久层。完全发展的绒毛膜由三层组成：（1）内部中等电子致密层; （2）迷宫中间层; （3）外层中电子致密层。绒毛膜形成后，卵母细胞分泌卵黄膜包膜。

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