Fine structural correlates of sensitivity in the eyes of the ctenid spider, Cupiennius salei Keys
Fine structural correlates of sensitivity in the eyes of the ctenid spider, Cupiennius salei Keys
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DOI：
10.1016/s0040-8166(97)80028-6
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发表时间：
1997-08-01
期刊：
影响因子：
2.6
通讯作者：
Eguchi, E
中科院分区：
文献类型：
--
作者：
Grusch, M;Barth, FG;Eguchi, E
我们研究了精细的结构相关的敏感性在夜间狩猎蜘蛛Cupiennius salei的主要和次要的眼睛。在夜间适应的眼睛中，主眼光感受器的四个杆粒长58 μ m，横截面（平均）共占234 μ m（2），而次眼光感受器的两个杆粒长约49 μ m，横截面（平均）为135-183 μ m（2），横纹肌（光敏结构）由紧密排列的微绒毛组成（直径0.1 μ m，最大长度3.5 μ m），并占据视网膜横截面积的63%，当计算的光的量的Cupiennius的眼睛能够捕获根据其形态特征，灵敏度S值（见土地，1981年，1985年）是78和109 μ m（2）之间。Cupiennius比任何其他狩猎蜘蛛更敏感，除了Dinopis的后正中眼睛是所有陆生节肢动物眼睛中最敏感的。白天适应眼的横纹肌微绒毛几乎完全降解，剩余的微绒毛面积仅为夜间适应眼的十分之一。salei。目前的精细结构数据进行比较，以前的电生理研究，并强调视觉的意义，在Cupiennius。
We studied fine structural correlates of sensitivity in the principal and secondary eyes of the nocturnal hunting spider Cupiennius salei. In night-adapted eyes the four rhabdomeres of the principal eye photoreceptors are 58 mu m long and occupy together 234 mu m(2) in cross-section (average), whereas the two rhabdomeres of the secondary eye photoreceptors are about 49 mu m long and measure 135-183 mu m(2) in cross-section (average), The rhabdoms (photosensitive structures) consist of tightly packed microvilli (diameter 0.1 mu m, maximum length 3.5 mu m) and occupy up to 63% of the cross-sectional area of the retina, When calculating the amount of light the eyes of Cupiennius are able to capture according to their morphological characteristics, the values for sensitivity S (see Land, 1981, 1985) are between 78 and 109 mu m(2). Cupiennius is more sensitive than any other hunting spider examined except Dinopis whose posterior median eyes are the most sensitive ones of all terrestrial arthropod eyes studied. In day-adapted eyes the rhabdomeral microvilli are almost completely degraded, The remaining microvillar surface amounts to only about one-tenth compared with the night-adapted state, Efferent synaptoid terminals have been found to contact the photoreceptors in all eyes of C. salei. The present fine structural data are compared to previous electrophysiological research and underline the significance of vision in Cupiennius.