Opposed bands of cilia in the nonfeeding larvae of the serpulid annelid Salmacina tribranchiata
Opposed bands of cilia in the nonfeeding larvae of the serpulid annelid Salmacina tribranchiata
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蛇形环节动物 Salmacina tribranchiata 不摄食幼虫的纤毛带相对
DOI：
10.1111/ivb.12285
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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：
--
作者：
Pernet, Bruno
海洋无脊椎动物的非摄食浮游幼虫通常缺乏幼虫摄食结构。这个概括的一个令人困惑的例外是环节动物分支Sabellidae，其中非摄食的幼虫具有纤毛带（特别是食物槽和后沟），据我们所知，除了摄食之外没有其他功能。Nishi和Yamasu （1992b, the University of the Ryukyus, science College Bulletin, 554, 107-121）发表的扫描电子显微照片显示，蛇形链齿动物salmacina dysteriii的非摄食幼虫也具有食物沟和阴部纤毛。在这里，我证明了非摄食的三branchatasalmacina幼虫也有纤毛带，根据位置可以识别为食物沟和后沟。纤毛跳动模式的高速视频显示，与原毛纤毛一起，这些带在一个相反的带系统中起作用。因此，在非摄食环节动物的幼虫中，摄食结构的存在比以前认识到的更为广泛。这种摄食结构的存在可能使向浮游生物的进化转变更有可能，并且可能是推断出幼虫摄食的起源是在蛇形环节动物的两个主要分支之一的共同祖先处，即蛇形环节动物。
The nonfeeding planktonic larvae of marine invertebrates typically lack larval feeding structures. One puzzling exception to this generalization is the annelid clade Sabellidae, in which nonfeeding larvae possess ciliary bands (specifically, food groove and metatroch) that, to the best of our knowledge, have no function other than in feeding. Nishi and Yamasu (1992b,Bulletin of the College of Sciences, University of the Ryukyus,54, 107–121) published a scanning electron micrograph showing that nonfeeding larvae of the serpulid annelidSalmacina dysterialso possess food groove and metatrochal cilia. Here I demonstrate that nonfeeding larvae ofSalmacina tribranchiataalso bear ciliary bands identifiable as food groove and metatroch by position. High‐speed video of ciliary beat patterns shows that, together with the prototrochal cilia, these bands function in an opposed band system. The presence of feeding structures in nonfeeding annelid larvae is thus more widely distributed than previously recognized. The presence of feeding structures may make evolutionary transitions to planktotrophy more likely, and may underlie an inferred origin of larval feeding in the common ancestor of one of the two major clades of serpulid annelids, Serpulinae.