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首页> 外文期刊>Marine biology >Embryonic larval and post-metamorphic development of the sea urchin Cassidulus mitis (Echinoidea; Cassiduloida): an endemic brooding species from Rio de Janeiro Brazil
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Embryonic larval and post-metamorphic development of the sea urchin Cassidulus mitis (Echinoidea; Cassiduloida): an endemic brooding species from Rio de Janeiro Brazil

机译：海胆Cassidulus mitis（Echinoidea； Cassiduloida）的幼虫和后变态发育：巴西里约热内卢的特有种

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摘要

Cassiduloids are currently rare irregular echi-noids with a highly conserved adult morphology. Aristotle's lantern is present only during the post-metamorphic stage, and little is known about the early development of species in this group. Cassidulus mitis produces eggs of about 375 urn in diameter, lecithotrophic larvae with four reduced arms with skeletal fenestrated rods, cilia along the body surface, and a ciliated band on arms and lobes. Offspring is brooded among the female spines from embryo to settler's stage. The echinopluteus larval stage is reached 6 days after fertilization, and the settler's stage is formed at the age of 17 days. Aristotle's lantern appears around the thirteenth day of development. The lantern is well developed and functional in settlers. It remains until at least 62 days after fertilization and can be used to acquire food from the environment. The early development of C. mitis is unusual concerning features of typical lecithotrophic larvae (such as reduced arms), but retains some features of planktotrophic larvae (such as skeletal rods and a ciliated band). Regarding egg size, early development in C. mitis seems to be transitioning from facultative lecithotrophic to typical obligate lecithotrophic pattern in echinoid larval evolution.
机译：Cassiduloids目前是罕见的不规则棘皮动物，具有高度保守的成人形态。亚里士多德的灯笼只在变质后阶段才出现，对该物种的早期发育知之甚少。肉食性小孢子虫产卵，直径约375 n，卵生营养幼虫，四臂缩小，具骨骼开孔杆，沿体表纤毛，臂和裂片上有纤毛带。从胚胎到定居者的阶段，后代在雌性棘突中繁育。受精后的棘足棘幼虫阶段达到了6天，而在17天的年龄就形成了定居者阶段。亚里士多德的灯笼出现在发展的第十三天。灯笼发达，可在定居者中使用。它保留到受精后至少62天，可用于从环境中获取食物。棉铃虫的早期发育在典型的营养型幼虫的特征（例如减少的臂）方面是不寻常的，但是保留了浮生型幼虫的一些特征（例如骨骼杆和纤毛带）。关于卵的大小，梭状芽胞杆菌的早期发育似乎正在从棘突性营养变态转化为棘突类幼虫的典型专性性营养变态。

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  • 来源
    《Marine biology》 |2011年第10期|p.2279-2288|共10页
  • 作者

    Mariana Contins; Carlos Renato Rezende Ventura;

  • 作者单位

    Departamento de Invertebrados, Laboratorio de Echinodermata,Museu Nacional/Universidade Federal do Rio de Janeiro (UFRJ), Quinta da Boa Vista, s°, Sao Cristovao, Rio de Janeiro, RJ 20940-040, Brazil;

    Departamento de Invertebrados, Laboratorio de Echinodermata,Museu Nacional/Universidade Federal do Rio de Janeiro (UFRJ), Quinta da Boa Vista, s°, Sao Cristovao, Rio de Janeiro, RJ 20940-040, Brazil;

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