The endostyle and the feeding filter in salps (Tunicata)
The endostyle and the feeding filter in salps (Tunicata)
复制标题
樽海鞘（Tunicata）的内管柱和进食过滤器
DOI：
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发表时间：
2000
影响因子：
1.2
通讯作者：
K. Ryan
中科院分区：
文献类型：
--
作者：
Q. Bone;C. Carré;K. Ryan
本笔记研究了咽部滤器在盐藻内的构造方式。对三种盐藻(Pegea confoederata、Thalia democatica和Salpa fusiformis)进行了检查：每种的结果基本相似。内花柱是咽部的一条深腹沟，由一条长长的基生纤毛隔开。它们的两侧是腺体细胞，它们分泌形成过滤器细丝之一的“粘液”。在这排腺体细胞的开口旁边，有一道由两排相邻的纤毛组成的栅栏。这两行中的第一行(最接近基线中线)，其顶端紧挨着小棒凸起，沿着内花柱规则地间隔1.0 μm，而第二行的纤毛大约为该间隔的一半。在内柱沟中向上穿过，第一纤毛网之后是纤毛区，然后第二排腺细胞与第二纤毛网相连，第二纤毛网只有一排纤毛。来自第一组腺体细胞的纤丝倾斜地穿过纤毛区，并继续越过第二个纤毛网。第二个栅栏的纤毛通常被非常醒目的边缘或绳索窗帘包围，当它们被第一组细丝连接在一起时，它们似乎溶解，沿着纤毛顺着纤毛流下，并将尖端作为细丝连接在一起，形成具有细长的斜方形网状结构的网。当它向上移动时，当它覆盖着一条引人注目的不对称的纤毛带时，网格或多或少变得方形，当它现在由两组垂直和水平运行的细丝组成时，间隔约1.3 μm。对形成这种滤网的各个方面进行了考虑。
This note examines the way the pharyngeal feeding filter is constructed within the salp endostyle. Three salp species (Pegea confoederata, Thalia democratica and Salpa fusiformis) have been examined: results from each are essentially similar. The endostyle is a deep ventral groove in the pharynx, divided by a line of long basal cilia. These are flanked by gland cells which secrete the ‘mucus” which forms one of the sets of filaments of the filter. Beside the openings of this basal row of gland cells (marked by bumps of curious ‘mucus’ rodlets), there is a fence of two adjacent rows of cilia. The first of these two rows, (nearest the basal mid-line), whose tips lie next to the rodlet bumps, are regularly spaced 1.0 μm apart along the endostyle, whilst the cilia of the second row are at around half this spacing. Passing upwards in the endostylar groove, this first ciliary fence is followed by a ciliated zone, and then a second row of glandular cells is linked to a second ciliary fence with a single row of cilia only. Filaments derived from the first set of gland cells pass obliquely over the ciliated zone, and continue over the second ciliary fence. The cilia of the second fence are often surrounded by very striking borders or curtains of rodlets which appear to dissolve, run down the cilia and pass off the tips as filaments, when they are joined by the first set of filaments to form a net with an elongate rhomboidal mesh. As this passes upwards, the mesh changes to become more or less square by the time it comes to overlie a striking asymmetrical band of cilia arranged in columns, when it is now composed of two sets of filaments running vertically and horizontally, spaced some 1.3 μm apart. Various aspects of the formation of this filter net are considered.