柚木野螟成虫复眼外部形态和超微结构观察

doi:10.16380/j.kcxb.2022.08.014

昆虫学报 ›› 2022, Vol. 65 ›› Issue (8): 1056-1067.doi: 10.16380/j.kcxb.2022.08.014

柚木野螟成虫复眼外部形态和超微结构观察

苑鹏宇¹, 胡可炎¹, 钱沉鱼¹, 王胜坤², 温秀军¹, 王偲¹, 马涛^1,*

(1. 华南农业大学林学与风景园林学院, 广州 510642; 2. 中国林业科学研究院热带林业研究所, 广州 510520)

出版日期:2022-08-20 发布日期:2022-09-16

Observation on the external morphology and ultrastructure of compound eyes of adult Eutectona machaeralis (Lepidoptera: Crambidae)

YUAN Peng-Yu¹, HU Ke-Yan¹, QIAN Chen-Yu¹, WANG Sheng-Kun², WEN Xiu-Jun¹, WANG Cai¹, MA Tao^1,*

(1. College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China; 2. Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, China)

Online:2022-08-20 Published:2022-09-16

摘要/Abstract

摘要： 【目的】柚木野螟Eutectona machaeralis主要取食危害珍贵树种柚木。本研究旨在观察研究柚木野螟成虫复眼的形态、组织结构和超微结构，分析其复眼结构特征，为更好了解该物种复杂的视觉行为与感光、趋光机制的关系奠定基础。【方法】运用光学显微镜以及扫描和透射电子显微镜技术观察了柚木野螟成虫复眼的形态、组织结构和超微结构。【结果】柚木野螟成虫复眼着生于头部触角基部，呈椭球形，属对称性复眼。雌、雄成虫复眼分别有2 300~2 755和1 950~2 316个小眼。小眼呈正六边形，表面密被角膜乳突，间隙偶有感觉毛。每个小眼由1个角膜、4个晶锥细胞、1对初级色素细胞，6个次级色素细胞、不同水平面分布的12个视网膜细胞和基膜等组成。沿小眼纵轴11个视网膜细胞的向心侧细胞膜特化成细丝状微绒毛，形成放射状排列的视小杆，组合呈融合型视杆；第12个视网膜细胞位于小眼基部。基膜上方，视网膜细胞和次级色素细胞末端膨大，以轴突形式穿过基底膜。【结论】柚木野螟复眼为典型的重叠像眼，雌、雄成虫小眼排列方式及内部结构无明显差异，但雌、雄虫小眼数量和大小具有明显的性二型现象。

关键词: 柚木野螟, 超微结构, 复眼, 小眼, 重叠像眼

Abstract: 【Aim】 Eutectona machaeralis mainly feeds on teak, a precious tree species. This study aims to observe and study the morphology, tissue structure and ultrastructure of the compound eyes of E. machaeralis adults, and to analyze the structural characteristics of the compound eyes, so as to lay a foundation for a better understanding of the relationship between the complex visual behavior and the photosensitive mechanism of this species. 【Methods】 Optical microscope, and scanning and transmission electron microscope techniques were used to observe the morphology, tissue structure and ultrastructure of compound eyes of E. machaeralis adults. 【Results】 The compound eyes of E. machaeralis adults are symmetrical compound eyes, born at the base of head antennae, and ellipsoidal in shape. The compound eyes of females and males have 2 300-2 755 and 1 950-2 316 ommatidia, respectively. The ommatidium is hexagonal, its surface is densely covered with corneal nipples, and there are occasional interfacetal hairs in the gap. Each ommatidium is composed of one cornea, four crystalline cone cells, one pair of primary pigment cells, six secondary pigment cells, 12 retinal cells distributed in different horizontal planes, and basement membrane. The centripetal cell membranes of 11 retinal cells along the longitudinal axis of the ommatidium are specialized into filamentous microvilli, forming radially arranged rhabdomere, which combine into a confluent rhabdom. The 12th retinal cell is located at the base of the ommatidium. Above the basement membrane, the ends of retinal cells and secondary pigment cells swell up, passing through the basement membrane in the form of axons. 【Conclusion】 The compound eyes of E. machaeralis are typical superposition eyes. There are no obvious differences in the arrangement and internal structure of ommatidia between the female and male adults, but the number and size of ommatidia in females and males present obvious sex dimorphism.

Key words: Eutectona machaeralis, ultrastructure, compound eye, ommatidia, superposition eye

苑鹏宇, 胡可炎, 钱沉鱼, 王胜坤, 温秀军, 王偲, 马涛. 柚木野螟成虫复眼外部形态和超微结构观察[J]. 昆虫学报, 2022, 65(8): 1056-1067.

YUAN Peng-Yu, HU Ke-Yan, QIAN Chen-Yu, WANG Sheng-Kun, WEN Xiu-Jun, WANG Cai, MA Tao. Observation on the external morphology and ultrastructure of compound eyes of adult Eutectona machaeralis (Lepidoptera: Crambidae)[J]. Acta Entomologica Sinica, 2022, 65(8): 1056-1067.

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柚木野螟成虫复眼外部形态和超微结构观察

Observation on the external morphology and ultrastructure of compound eyes of adult Eutectona machaeralis (Lepidoptera: Crambidae)

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