机敏异漏斗蛛体表超微感受器的扫描电镜观察

Observations on Microreceptors on the Surface of the Funnel-web Spider(Allagelena difficilis)

为了阐明机敏异漏斗蛛(Allagelena difficilis)对外界刺激的感受机制,利用扫描电镜对其体表的超微感受器进行了观察。机敏异漏斗蛛的体表感受器多样,毛状感受器的种类和数目最多,包括触毛、听毛、味觉毛、毛状刺、羽状毛、棘,广泛分布在体表各部;三明治状感受器分布于蜘蛛腹部背面和腹面以及步足等处;半球状感受器分布于蜘蛛的步足;单裂缝感受器和琴形器也主要分布于步足。

Aiming to determine the mechanisms by which the funnel-web spider（Allagelena difficilis） reacts to multiple external stimuli, the sensilla on its body surface were studied by scanning electronic microscope（SEM）. Six male and female spiders that are fixed in 70% alcohol solution were rinsed several times with distilled water. Having been dehydrated in alcohol of different concentrations, they are displaced with tert-butyl alcohol. Finally, the sample was observed after critical point drying and metal films. The investigation found that there are several types of sensilla on the body surface of Allagelena difficilis. Hair sensilla, which include trichobothrium（Fig. 1）, gustatory hairs（Fig. 2）, tactile hairs（Fig. 3）, sigmoidal setaes（Fig. 4）, spines（Fig. 8 and Fig. 10） and plumose hairs（Fig. 9）, are dominant and found on various parts of the body surface. The sandwich-like mechanosensory organs（Fig. 6） are the second most common in amount and distribute widely over the dorsal and ventral surfaces of the spider′s abdomin as well as the legs. The cell half-ball-like mechanosensory sensilla（Fig. 7）, single slit sensilla and the lyriform organs（Fig. 5） mainly disperseover the surface of the spider′s legs.