The cleavage pattern in the leech Theromyzon tessulatum (Hirudinea, Glossiphoniidae)
The cleavage pattern in the leech Theromyzon tessulatum (Hirudinea, Glossiphoniidae)
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水蛭 Theromyzon tessulatum（Hirudinea，Glossiphoniidae）的分裂模式
DOI：
10.1002/jmor.1051960210
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发表时间：
1988
影响因子：
1.5
通讯作者：
W. Dohle
中科院分区：
文献类型：
--
作者：
M. Sandig;W. Dohle
为了评估glossiphoni类水蛭Glossiphonia complanata和Theromyzon tessulatum的卵裂模式差异，先前由m<e:1>('32)和施密特（'17,'41）研究，重新检查Theromyzon tessulatum的卵裂模式。在胚胎发育的前29小时，对每个发育阶段的胚胎进行观察、拍照和连续切片。确切的细胞谱系直到完成成端细胞形成被报道。除了一些以前未报道的特征外，我们发现舌音水蛭的中胚层前体细胞，可能和大多数环节动物一样，不是3D细胞，而是由3D细胞额外分裂形成的4d细胞。结果进一步表明，所有舌音水蛭可能具有共同的卵裂模式，而舌音水蛭与舌音水蛭之间不存在主要差异。本文比较了一些少毛纲和水蛭纲的解理模式，并讨论了一个纤毛虫祖先种解理的多形性特征及其在现代种中的偏差。
In order to evaluate the differences in the cleavage patterns of the glossiphoniid leeches Glossiphonia complanata and Theromyzon tessulatum, previously studied by Müller ('32) and Schmidt ('17, '41), the cleavage of Theromyzon tessulatum was reexamined. For the period of the first 29 hours of development embryos were observed, photographed, and serially sectioned for light microscopy at each developmental stage. The exact cell lineage until completion of teloblast formation is reported. Besides some other not previously reported features, we show that the mesoteloblast precursor cell in the glossiphoniid leeches, as probably in most Annelida, is not the cell 3D, but cell 4d formed by an additional division of cell 3D. The results further indicate that all glossiphoniid leeches likely share a common cleavage pattern, and that major differences between Glossiphonia complanata and Theromyzon tessulatum do not exist. A comparison between the cleavage patterns of some Oligochaeta and Hirudinea is made, and plesiomorphic characters in the cleavage of a clitellate ancestor species and their deviations in present day species are discussed.
舌水蛭 Helobdella triserialis 神经发生过程中外胚层的相互作用。
影响因子：
2.7
作者：
Blair,SS;Weisblat,DA
通讯作者：
Weisblat,DA