The fine structure of a cephalic sensory receptor in the copepod Doropygus seclusus Illg (Crustacea: Copepoda: Notodelphyidae)
The fine structure of a cephalic sensory receptor in the copepod Doropygus seclusus Illg (Crustacea: Copepoda: Notodelphyidae)
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桡足类 Doropygus seclusus Illg 头部感觉受体的精细结构（甲壳类：桡足类：Notodelphyidae）
DOI：
10.1002/jmor.1051380403
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发表时间：
1972
影响因子：
1.5
通讯作者：
P. L. Dudley
中科院分区：
文献类型：
--
作者：
P. L. Dudley
在无节幼体和桡足类中描述了一种推测具有感觉功能的头部器官。受体，位于两侧的前背头区域，是由树突的额外的视神经前脑的起源，具有纤毛突起与基体，没有小根，和9 + 0型的基础设施。纤毛不分支，其末端仅含有1至4个微管。在无节幼体和自由生活的桡足类动物中，一个大的表皮支持细胞将一个树枝状突起的末端及其纤毛包裹在囊内。其他树突和它们的纤毛穿过支持细胞，最后，纤毛逃逸形成与前外侧头角质层接触的轮状束。后一种终末器官在第二桡足虫阶段达到最大的发育-感染海鞘的阶段。桡足类的所有共生阶段都只有一个比例较小的囊状终器，显然缺乏由纤毛末端轮组成的终器。该受体的功能尚不清楚，但有人认为，在共生阶段消失的终末器官在第二桡足类中起着识别宿主的作用。
A cephalic organ of presumed sensory function is described in nauplii and copepodids of the ascidicolous copepod Doropygus seclusus Illg. The receptor, located bilaterally in the anterodorsal head region, is composed of dendrites of extra optic protocerebral origin which have ciliary protrusions with basal bodies, no rootlets, and a basal infrastructure of the 9 + 0 type. The cilia do not branch and their distal terminations contain only one to four microtubules. In nauplii and free‐living copepodids, a large epidermal supporting cell encapsulates the end of one dendrite and its cilia in a sac. Other dendrites and their cilia pass through the supporting cell and, terminally, the cilia escape to form a whorled fascicle which contacts the anterolateral cephalic cuticle. The latter end organ reaches its greatest development in the second copepodid stage — the stage which infects the ascidian. All of the symbiotic stages of the copepod have only a proportionately smaller end organ of the saccular type and apparently lack the end organ consisting of whorls of ciliary ends. The function of the receptor is unknown, but it is suggested that the end organ which disappears in the symbiotic stages functions in second copepodids in host recognition.