Unusual coelom formation in the direct-type developing sand dollar Peronela japonica
Unusual coelom formation in the direct-type developing sand dollar Peronela japonica
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直接型发育沙元 Peronela japonica 异常体腔形成
DOI：
10.1002/dvdy.22751
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Masaaki Yamaguchi
中科院分区：
文献类型：
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作者：
Jun Tsuchimoto;Toshihiro Yamada;Masaaki Yamaguchi
Peronella japonicais是一种沙元，其受精卵发育成一个缩短的pluteus，但在第三天变态。成虫的原基形成是独特的;它使用了水腔的中间位置和覆盖水腔背侧的前庭的口道样内陷。然而，体腔形成的发育过程仍然不清楚。在这项研究中，我们通过从幼虫的连续切片重建三维图像来检查这一过程。结果表明，左体腔由原肠腔和肠腔共同发育，而水腔和右体腔由肠腔共同发育。这种体腔形成跳过最初的双侧阶段，直接沿着成体口背轴排列体腔室。此外，我们的数据表明P. japonicaretes的祖先沿着左右轴的不对称性在成人的雏形的位置。Developmental Dynamics 240：2432-2439，2011.© 2011 Wiley Periodicals，Inc.
Peronella japonicais a sand dollar with a zygote that develops into an abbreviated pluteus but then metamorphoses on day three. The adult rudiment formation is unique; it uses a median position of the hydrocoel and a stomodeum‐like invagination of vestibule that covers the dorsal side of the hydrocoel. However, the developmental processes underlying coelom formation remain unclear. In this study, we examined this process by reconstructing three‐dimensional images from serial sections of larvae. We show that the left coelom developed by both schizocoely and enterocoely from the archenteron tip, whereas the hydrocoel and right coelom formed by enterocoely from the archenteron. This coelom formation arranged the coelomic compartments directly along the adult oral‐aboral axis by skipping the initial bilateral phases. Furthermore, our data indicateP. japonicaretains ancestral asymmetry along the left‐right axis in the location of the adult rudiment. Developmental Dynamics 240:2432–2439, 2011. © 2011 Wiley Periodicals, Inc.