Direct Development in the Sea Urchin Phyllacanthus parvispinus (Cidaroidea): Phylogenetic History and Functional Modification

Direct Development in the Sea Urchin Phyllacanthus parvispinus (Cidaroidea): Phylogenetic History and Functional Modification
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海胆Phyllacanthus parvispinus(Cidaroidea)的直接发育:系统发育历史和功能修饰

DOI:
10.2307/1541838
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发表时间:
1989
期刊:
The Biological Bulletin
影响因子:
--
通讯作者:
R. Raff
R. Raff
中科院分区:
--
文献类型:
--
作者:
A. Parks;B. Bisgrove;G. Wray;R. Raff

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澳大利亚海胆Phyllacanthus parvispinus(海胆总科:海胆总科)的发育令人感兴趣,因为它具有高度修饰的卵黄营养幼虫,并且因为它属于海胆科,其发育研究很少。本研究记录了小棘鳅的早期发育和变态,并认为其特征的进化在棘鳅个体发育中是不寻常的。一些特征,如缺乏前庭,出现在其他类西达类中,可能是祖先的产物。其他不寻常的功能,如较大的配子,平等的第四卵裂,一个褶皱的囊胚,和加速发展的成年人的雏形,是其他直接发展的echinoids的特点,并可能是功能修改改变的发展模式。由于Cidaroidea形成姐妹群,更衍生的Euechinoidea,cidaroid的发展是至关重要的评估echinoids之间的个体发育的发育。现存的棘球蚴发育特征的分布表明...
Development in the Australian sea urchin Phyllacanthus parvispinus (Echinoidea: Cidaroidea) is of interest because it has a highly modified, lecithotrophic larva, and because it belongs to an echinoid group whose development has been little studied. This study documents early development and metamorphosis in P. parvispinus and considers the evolution of features unusual in echinoid ontogeny. Some features, such as lack of a vestibule, occur in other cidaroids, and are likely a product of ancestry. Other unusual features, such as larger gametes, an equal fourth cleavage, a wrinkled blastula, and accelerated development of the adult rudiment, are characteristic of other direct developing echinoids, and are probably functional modifications for altered developmental mode. Since the Cidaroidea form the sister group to the more derived Euechinoidea, cidaroid development is critical in assessing the phylogeny of ontogeny among echinoids. The distribution of developmental features among extant echinoids suggests...
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影响因子: 2.7
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