Thysanura

The term Thysanura, meaning "fringed wings," was a former insect order that is now considered obsolete. It broadly encompassed primitive wingless insects, including proturans, collembolans (springtails), diplurans, and the orders Zygentoma and Archaeognatha. These insects are characterized by six legs and a lack of wings, undergoing simple metamorphosis.123

While some entomologists now classify proturans, collembolans, and diplurans as separate classes, the Zygentoma and Archaeognatha are still sometimes referred to as thysanurans. These groups, such as silverfish and bristletails, are characterized by three tail filaments and are found in leaf litter and moist environments. The order Thysanoptera, commonly known as thrips, are tiny winged insects with fringed wings, distinct from the former Thysanura order.324