Ultrastructure and Spectral Characteristics of the Compound Eye of (Baly, 1881) (Coleoptera, Chrysomelidae)

Overview

Journal Insects

Specialty Biology

Date 2024 Jul 26

PMID 39057265

Authors

Zu-Long Liang

Tian-Hao Zhang

Jacob Muinde

Wei-Li Fan

Ze-Qun Dong

Feng-Ming Wu

Zheng-Zhong Huang

Si-Qin Ge

Affiliations

Soon will be listed here.

Abstract

In this study, the morphology and ultrastructure of the compound eye of were examined by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), micro-computed tomography (μCT), and 3D reconstruction. Spectral sensitivity was investigated by electroretinogram (ERG) tests and phototropism experiments. The compound eye of is of the apposition type, consisting of 611.00 ± 17.53 ommatidia in males and 634.8 0 ± 24.73 ommatidia in females. Each ommatidium is composed of a subplano-convex cornea, an acone consisting of four cone cells, eight retinular cells along with the rhabdom, two primary pigment cells, and about 23 secondary pigment cells. The open type of rhabdom in consists of six peripheral rhabdomeres contributed by the six peripheral retinular cells (R1~R6) and two distally attached rhabdomeric segments generated solely by R7, while R8 do not contribute to the rhabdom. The orientation of microvilli indicates that is unlikely to be a polarization-sensitive species. ERG testing showed that both males and females reacted to stimuli from red, yellow, green, blue, and ultraviolet light. Both males and females exhibited strong responses to blue and green light but weak responses to red light. The phototropism experiments showed that both males and females exhibited positive phototaxis to all five lights, with blue light significantly stronger than the others.

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