Zygentoma

The order Zygentoma, also known as silverfish, fishmoths, and firebrats, comprises primitive, wingless insects. These insects are characterized by their slender, flat bodies, three tail bristles, and silvery scales. They are found worldwide, often inhabiting indoor environments.1

Zygentoma are considered pests because they feed on starchy materials like paste, bookbindings, and wallpaper, which can damage books and fabrics. Unlike many insects that reproduce through copulation, Zygentoma engage in courtship rituals where the male deposits a sperm packet for the female. Their eggs are laid in cracks or soil, and the young hatch scaleless and with short appendages, molting periodically throughout their lives, even after reaching sexual maturity.1

These insects are classified within the broader group of apterygotes, which are primitive wingless insects. While the taxonomic status of apterygotes is debated, Zygentoma are generally considered ancestors of winged insects.2