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Re-examination on the evolution of embryonic membranes in the Atelocerata, with special reference to the functional specialization

重新审视无角动物胚胎膜的进化，特别是功能特化

基本信息

批准号：
03640622
负责人：
MACHIDA Ryuichiro
金额：
$ 1.34万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

Phylogenies of the atelocerates and hexapods have been developed, based on their embryonic membranes. However, these phylogenies seem to have been misleadingly brought about from the insufficient or erroneous observational data, and I started to study- in detail the embryonic membranes of the animals on which careful investigations were needed but wanted, i. e., the Microcoryphia and Thysanura, so as to extend the comprehensive discussion on the evolution of atelocerate embryonic membranes.Achievements produced in this study are as. follows, and they are published into one review and four original papers.1. The embryonic membrane fold of microcoryphians is qualitatively to be serosal.2. The serosal fold in the Microcoryphia is to have been acquired in the evolution, as a sequel to the renounce of the ability for secreting the cuticular egg envelope by the embryonic area, which should have occurred in the course of ateloceratan evolution, The condition of embryonic membrane fold in the Microcoryphia may be read as the "preadaptation" to the amnioserosal fold shown in the Thysanura-Pterygota.3. There is no evidence that the yolk fold in the Microcoryphia is homologous to the amnioserosal fold in the Thysanura-Pterygota : these folds have been phylogenetically correlated with each other.4. The succession of functional specialization between the embryo and embryonic membranes through the atelocerate evolution can be recognized as : Myriapoda* Collembolans/Diplura*Microcoryphia*Thysanura-Pterygota.5. The amnioserosal fold in the Thysanura-Pterygota appears to have the functional role of secreting a serosal cuticle beneath the embryo as the principal one, as the embryonic membrane fold in the Microcoryphia.6. The condition of embryonic membranes of a thysanuran Thermohia domestica has been accepted to represent the ancestral, but it proved to be not ancestral but derived or autapomorphic.

基于胚胎膜，无端动物和六足动物的系统发育已被开发出来。然而，这些系统发育似乎是由不充分或错误的观察数据引起的误导，我开始详细研究动物的胚胎膜，需要仔细研究，但又想要，即。本研究取得的成果如下：如下，并发表为一篇综述和四篇原创论文。 1．小蠹虫的胚胎膜皱襞本质上是浆膜状的。2． Microcoryphia 中的浆膜褶皱是在进化中获得的，作为胚胎区域放弃分泌角质层卵膜的能力的后续结果，这应该发生在无角动物的进化过程中。缨尾目-翼状目.3。没有证据表明Microcoryphia中的卵黄褶皱与Thysanura-Pterygota中的羊膜浆膜褶皱是同源的：这些褶皱在系统发育上彼此相关。4．通过无端进化，胚胎和胚胎膜之间的功能特化的连续性可以被认为是：多足纲*弹尾纲/Diplura*Microcoryphia*Thysanura-Pterygota.5。缨尾翼动物中的羊膜膜皱襞似乎具有在胚胎下方分泌浆膜角质层作为主要功能的功能，就像小核藻中的胚胎膜皱襞一样。6．缨牛类Thermohia Domestica的胚胎膜状况已被认为代表其祖先，但事实证明它不是祖先的，而是衍生的或自体的。