Compound Eye of the Firefly
By Terry Lynch, Naturalist and Photographer

Compound Eye of the Firefly, Photinus sp. SEM Copyright © 2011 by Dennis Kunkel Microscopy, Inc.

Shown here is a SEM of the large spherical compound eye of Photinus sp. (Dwarf tribe of P. pyralis, Mt. Cheaha, AL). This image has been digitally enhanced to express the numerous hexagonal cuticular cornea or facets. Fireflies have two large compound eyes which have a dark black, shiny hue and coloration when observed by the naked eye.

Naturalist Terry Lynch collected, preserved, provided, identified, and described this specimen of a dwarf species of firefly occurring atop Mt. Cheaha in Alabama at 2,407 feet above sea level. Lynch had SEM images made of the firefly's compound eye which he digitally enhanced to illustrate its amazing structure. Fireflies use their large compound eyes to locate mates as they fly and flash during twilight and evening hours. Hence the large compound eyes of fireflies have evolved to enable male fireflies to see the return flashes of female fireflies of the same species. Some predaceous species of fireflies, namely Photuris, are able to fool Photinus firefles by mimicing the flash response of females, luring male Photinus fireflies, then pouncing upon, killing and eating them.

Original Articles and reports by Terry Lynch

Enjoy reading these original articles and reports about fireflies by Terry Lynch who has long enjoyed spending his summer evenings watching the dance of fireflies in fields, meadows and forests. Lynch has been studying fireflies since he was a teenager and lived at the edge of Talladega National Forest in Jacksonville, Alabama, where Photinus pyralis occurred in such great numbers one could easily net hundreds in the course of five or ten minutes. Today such large numbers of firefly have decreased in many areas due to the impact of urbanization, over spraying for mosquitoes, light pollution and other factors. Learning about fireflies is the first step in preserving them that our children's children will still be able to enjoy watching fireflies twinkle and flash during their twilight mating dance each summer.







Copyright © 2011 by Terry Lynch and other copyright holders. All rights reserved.

Credits: Specimens of fireflies collected, preserved, identified, described, and provided were imaged by Dennis Kunkel of Dennis Kunkel Microscopy, Inc. Any usage of these images requires prior and written permission of the owner/s.