Fine Structure of the Distal Sensory Setae on the First Antennae of Pleuromamma Xiphias Giesbrecht (Copepoda)
Fine Structure of the Distal Sensory Setae on the First Antennae of Pleuromamma Xiphias Giesbrecht (Copepoda)
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Pleuromamma Xiphias Giesbrecht（桡足类）第一触角远端感觉刚毛的精细结构
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
P. Lenz
中科院分区：
文献类型：
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作者：
T. Weatherby;Katy K. Wong;P. Lenz
摘要对深海甲壳类桡足类--翼乳腹足第一触角的远端节段和刚毛进行了外部(扫描电镜、光学显微镜)和内部(连续切片)的研究。形态观察结果表明，在第一根触角的远端有9根可识别的刚毛。这包括5个双神经支配的和2个单神经支配的机械感受性刚毛。鉴定出单个薄壁趋化毛，由多个树突支配。据推测，双峰型机械/化学感受性刚毛顶端有孔，由1个机械和2个化学感觉树突支配。在第一根触角远端的腹面上发现两个气孔：1靠近化学感觉毛的底部，另一个靠近羽毛的刚毛的近端。在内部，机械感受器的特征是发育良好的鞘小管和树突状微管的异常增殖(高达3,000个/树突状)。在外部，刚毛的长度(0.01-1毫米)和类型(光滑与羽状，僵硬与柔软，圆形与横向扁平)不同。刚毛位于一个平面上，指向前面或后面。形状和位置的多样性表明个体刚毛的感官特化。
ABSTRACT An external (SEM, light microscopy) and internal (TEM, serial section) study of the distal segments and the setae of the first antenna in Pleuromamma xiphias, a deep-ocean calanoid copepod, is presented here. The morphological results indicate the presence of 9 identifiable setae on the distal tip of the first antenna. These include 5 dually innervated and 2 singly innervated mechanoreceptive setae. A single thin-walled chemoreceptive seta, innervated by multiple dendrites, was identified. A presumed bimodal mechano-/chemoreceptive seta has an apical pore and is innervated by 1 mechano- and 2 chemosensory dendrites. Two pores were found on the ventral surface of the distal segments of the first antenna: 1 near the base of the chemosensory seta, and the other proximal to the feathered seta. Internally, the mechanoreceptors are characterized by well-developed scolopale tubes and an extraordinary proliferation of dendritic microtubules (up to 3,000/dendrite). Externally, the setae vary in length (0.01-1 mm) and type (smooth versus plumose, stiff versus flexible, round versus laterally flattened). The setae are positioned in a single plane, pointing either anteriorly or posteriorly. The diversity in form and position suggests sensory specialization of individual setae.