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首页> 外文期刊>Russian journal of marine biology >The morphology of the frontal filaments in the nauplii of Verruca stroemia (Muller, 1776) and Hesperibalanus hesperius (Pilsbry, 1916) (Cirripedia: Thoracica)
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The morphology of the frontal filaments in the nauplii of Verruca stroemia (Muller, 1776) and Hesperibalanus hesperius (Pilsbry, 1916) (Cirripedia: Thoracica)

机译：疣状疣的无节幼体（Muller，1776年）和Hesperibalanus hesperius（Pilsbry，1916年）中额叶细丝的形态（Cirripedia：Thoracica）

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Scanning electron microscopy was used to investigate the fine morphology of the frontal filaments (FFs) in nauplial stages of the barnacles Verruca stroemia (Muller, 1776) and Hesperibalanus hesperius (Pilsbry, 1916). Changes in the FF structure in the course of development were examined. The FFs that were revealed in nauplial stage II were retained at all the subsequent nauplial stages. Small openings, which were located either apically or subapically, were found at the top of each FF in both species. In addition, the surface of an FF bears longitudinal grooves. The FFs are not separated from the body; however, each of them has a constriction at the base. In the nauplii of both species, the FFs have a wide proximal and a thin distal part. The area between the proximal and distal parts in V. stroemia has the form of a single crease; in H. hesperius, it resembles an accordion-shaped series of creases. The length ratio of the proximal/distal parts remains constant during all nauplial stages, but it varies between species. The proximal part constitutes 20-25% of the FF length in V. stroemia, while in H. hesperius the proximal and distal parts are approximately equal. The frontal filament length increases proportionally to the length of the larval body in the course of development. The possible functions of FFs as sense organs, their occurrence among the crustaceans, and possible homology with the preantennal limbs are discussed.
机译：扫描电子显微镜用于研究藤壶Verruca stroemia（Muller，1776）和Hesperibalanus hesperius（Pilsbry，1916）的幼体阶段额叶细丝（FFs）的精细形态。研究了FF在发展过程中的变化。在无节幼体阶段II中显示的FFs保留在随后的所有无节幼体阶段中。在两个物种的每个果蝇的顶部都发现了位于顶端或近顶端的小开口。另外，FF的表面带有纵向凹槽。 FF没有与身体分离；然而，他们每个人在基地都有一个收缩。在这两个物种的无节幼体中，果蝇具有较宽的近端和较薄的远端。恒河猴的近端和远端之间的区域呈单折痕形式；在hesperius中，它类似于手风琴形的折痕。在所有无节幼体阶段，近端/远端部分的长度比保持恒定，但在物种之间有所不同。近端部分构成静脉曲张的FF长度的20-25％，而在H. hesperius中，近端部分和远端部分大致相等。在发育过程中，额丝长度与幼体的长度成比例地增加。讨论了FFs作为感官器官的可能功能，它们在甲壳类动物中的发生以及与前庭前肢的可能同源性。

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