An oral brush of cilia in the feeding larvae of Micronephtys cornuta (Annelida, Nephtyidae)
An oral brush of cilia in the feeding larvae of Micronephtys cornuta (Annelida, Nephtyidae)
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Micronephtys cornuta（环节动物，Nephtyidae）进食幼虫中的纤毛口腔刷
DOI：
10.1111/ivb.12287
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发表时间：
2020
影响因子：
1.2
通讯作者：
Pernet, Bruno
中科院分区：
文献类型：
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作者：
Pernet, Bruno
许多杀叶虫环节动物的幼虫都是嗜食性的，但在这个不同的分支中，幼虫的摄食机制知之甚少。许多幼虫属于一个大型的叶状门，Aphroditiformia，带有一束长纤毛，附着在原轮的左侧，口腔刷，它们用来进食。在1936年，D.P. Wilson观察到一种名为Nephtys hombergi的轮担幼虫，在身体的左侧有一束非常相似的长纤毛。自威尔逊的观察以来，已经发表了许多关于neptyid幼虫的描述，但没有一个关于口腔刷的存在的评论。在这里，我表明，metatrochophore I和II幼虫ofacrophtys cornutabear的口腔刷，但它是失去了在过渡到nectochaete阶段，在此期间，幼虫的嘴和前肠也被改造的功能，在底栖动物喂养的少年。在两个属的至少一些幼虫阶段中明显存在口刷，这表明口刷可能广泛存在于nephtyids的摄食幼虫中，但80多年来一直被忽视。额外的工作是需要作出推论phyllodocidan环节动物的口腔刷的进化历史，并区分几种假设的功能，这一特殊的纤毛组幼虫喂养。
Larvae of many phyllodocidan annelids are planktotrophic, but the feeding mechanisms of larvae in this diverse clade are poorly known. Many larvae belonging to one large clade of phyllodocidans, Aphroditiformia, bear a bundle of long cilia attached to the left side of the prototroch, the oral brush, which they use in feeding. In 1936, D.P. Wilson observed that trochophore larvae ofNephtys hombergi, a member of the phyllodocidan family Nephtyidae, bore a strikingly similar bundle of long cilia on the left side of the body. Since Wilson's observation, numerous descriptions of nephtyid larvae have been published, but none remark on the presence of an oral brush. Here I show that metatrochophore I and II larvae ofMicronephtys cornutabear an oral brush, but that it is lost in the transition to the nectochaete stage, during which the larval mouth and foregut are also being remodeled to function in benthic feeding by juveniles. That an oral brush is clearly present in at least some larval stages of two genera suggests that oral brushes may be widespread in the feeding larvae of nephtyids, but have simply been overlooked for more than 80 years. Additional work is needed to make inferences on the evolutionary history of the oral brush in phyllodocidan annelids, and to distinguish among several hypotheses on the function of this peculiar group of cilia in larval feeding.