Hao Yingying, Wang Qi, Wen Chao, Wen Junbao
State Key Laboratory of Efficient Production of Forest Resources, Beijing Forestry University, Beijing 100083, China.
Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing 100083, China.
Insects. 2023 Aug 10;14(8):699. doi: 10.3390/insects14080699.
and are the main borers of , causing serious economic and ecological losses. The external morphology and internal ultrastructure of the compound eyes of two related weevils were investigated with light microscopy, scanning electron microscopy, and transmission electron microscopy. and possess a pair of reniform apposition compound eyes and contain about 550 ommatidia per eye. The interommatidial angle of and are 7.08 ± 0.31° and 4.84 ± 0.49°, respectively. The corneal thickness, rhabdom length, and ommatidium length of are significantly greater than those of . Under light-adapted conditions, the pigment granules are mainly distributed at the junction of the cone and the rhabdom, and the diameter and the cross-sectional area of the middle end of the rhabdom is increased in the two weevil species. Under dark-adapted conditions, the pigment granules shift longitudinally and are evenly distributed on both sides of the cone and the rhabdom, and the diameter and cross-sectional area of the middle end of the rhabdom are decreased. The discrepancy in visual structure is beneficial for adaptation to niche differentiation of the two related species. The present results suggest that the two weevils possess different visual organ structures to perceive visual information in the external environment.
[具体两种象鼻虫名称1]和[具体两种象鼻虫名称2]是[具体宿主名称]的主要蛀虫，会造成严重的经济和生态损失。利用光学显微镜、扫描电子显微镜和透射电子显微镜对两种相关象鼻虫复眼的外部形态和内部超微结构进行了研究。[具体两种象鼻虫名称1]和[具体两种象鼻虫名称2]拥有一对肾形并列复眼，每只眼睛约有550个小眼。[具体两种象鼻虫名称1]和[具体两种象鼻虫名称2]的小眼间角分别为7.08±0.31°和4.84±0.49°。[具体两种象鼻虫名称1]的角膜厚度、视杆长度和小眼长度显著大于[具体两种象鼻虫名称2]。在明适应条件下，色素颗粒主要分布在视锥和视杆的交界处，两种象鼻虫视杆中端的直径和横截面积均增大。在暗适应条件下，色素颗粒纵向移动并均匀分布在视锥和视杆两侧，视杆中端的直径和横截面积减小。视觉结构的差异有利于适应两种相关物种的生态位分化。目前的结果表明，两种象鼻虫拥有不同的视觉器官结构来感知外部环境中的视觉信息。
