Xenoturbella bocki exhibits direct development with similarities to Acoelomorpha.
Xenoturbella bocki exhibits direct development with similarities to Acoelomorpha.
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DOI：
10.1038/ncomms2556
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发表时间：
2013
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
--
作者：
博氏Xenoturella Bocki是一种体型简单的海洋动物，最近被认为是无形纲的姐妹群，共同形成了新的门类--隐形纲。该门的系统发育地位仍然存在争议，要么是作为一个早期的分枝双侧纲动物，要么是作为后口动物中的棘皮动物和半角动物的姊妹群。虽然已经描述了几种无尾轮虫的发育，但对Xenoturella的生活史知之甚少。在这里，我们报告了Xenoturella的胚胎阶段，并表明它是一个直接的显影剂，没有摄食幼虫的阶段。这种发育模式与异形类相似，支持新提出的异形纲，并表明该门的最后共同祖先可能是直接发展者。Xenoturella是一种简单的海洋蠕虫，最近被认为是后口动物或早期分枝的双边动物。Nakano等人。报道首次观察到的来自Xenoturella的自然产卵和胚胎，并揭示了后生动物发展的进化史。
Xenoturbella bocki, a marine animal with a simple body plan, has recently been suggested to be sister group to the Acoelomorpha, together forming the new phylum Xenacoelomorpha. The phylogenetic position of the phylum is still under debate, either as an early branching bilaterian or as a sister group to the Ambulacraria (hemichordates and echinoderms) within the deuterostomes. Although development has been described for several species of Acoelomorpha, little is known about the life cycle of Xenoturbella. Here we report the embryonic stages of Xenoturbella, and show that it is a direct developer without a feeding larval stage. This mode of development is similar to that of the acoelomorphs, supporting the newly proposed phylum Xenacoelomorpha and suggesting that the last common ancestor of the phylum might have been a direct developer. Xenoturbella is a simple marine worm recently suggested to be either a deuterostome or an early branching bilaterian. Nakano et al. report the first observations of naturally spawned eggs and embryos from Xenoturbella, and uncover new insights into the evolutionary history of metazoan development.
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影响因子：
9.2
作者：
Kamm, Kai;Schierwater, Bernd;Miller, David J.
通讯作者：
Miller, David J.
影响因子：
2.5
作者：
Lundin, K
通讯作者：
Lundin, K
影响因子：
7.7
作者：
Bourlat, Sarah J.;Nakano, Hiroaki;Obst, Matthias
通讯作者：
Obst, Matthias
影响因子：
10.7
作者：
de Mendoza A;Ruiz-Trillo I
通讯作者：
Ruiz-Trillo I
影响因子：
1.2
作者：
LESTER, SM
通讯作者：
LESTER, SM