龟纹瓢虫成虫的复眼形态及其显微结构

利用光镜、组织切片法观察了龟纹瓢虫Propylaea japonica(Thunberg)成虫的复眼形态及其显微结构。结果如下:(1)头正前方观,复眼外形似半球,且后方稍向内合拢。每个复眼约包括630个小眼。(2)每个小眼是由1套屈光器(1个角膜和1个晶锥)、6至8个小网膜细胞及其特化产生的视杆和基细胞等几部分组成。晶体周围及小网膜色素细胞内均含有丰富的色素颗粒。(3)小眼整体纵切显示,其上、下段色素颗粒分布相对较多,中段分布较少。(4)明、暗适应状态对小眼的色素颗粒分布有影响,性别对其分布无明显影响。明适应状态下,其色素颗粒较均匀地分布于视杆两侧上下,暗适应状态时色素颗粒则主要分布在视杆部位的上侧,显示其具有一定的重叠眼性质;而在相同的明、暗适应状态下其雌、雄成虫复眼的色素颗粒分布间无明显差异。

The morphology and fine structure of the compound eye of Propylea japonica

The morphology and fine structure of the compound eye of Propylaea japonica(Thunberg)were investigated.The compound eyes distributed the upside lateral of the head slightly convergent posteriorly.Each compound eye was composed of approximately 630 ommatidia.Each ommatidium consisted of a cornea,a cone, six to eight retinula cells and a basal cell.The surrounding of the crystalline and the retinular pigment cells contained abundant pigment granules.The longitudinal section of the whole rhabdom showed that the pigment granules in the distal and proximal ends were more than those in the intermediate region relatively.In the light-adapted state,the pigment granules distributed in the most regions around the rhabdoms evenly.However,the distribution of the pigment granules was mainly around the distal region of the rhabdoms in the dark-adapted state, indicating that it had some characters of superposition eyes.No differences were observed between both male and female.