Science, Tech, Math › Animals & Nature Insect Classification - Subclass Apterygota Insects That Lack Wings Share Flipboard Email Print Silverfish are apterygotes, meaning they are primitively wingless insects. Getty Images/E+/arlindo71 Animals & Nature Insects Basics Behavior & Communication Ants. Bees, & Wasps Beetles Butterflies & Moths Spiders Ticks & Mites True Bugs, Aphids, Cicadas, and Hoppers Amphibians Birds Habitat Profiles Mammals Reptiles Wildlife Conservation Marine Life Forestry Dinosaurs Evolution View More By Debbie Hadley Entomology Expert B.A., Political Science, Rutgers University Debbie Hadley is a science educator with 25 years of experience who has written on science topics for over a decade. our editorial process Debbie Hadley Updated March 17, 2017 The name Apterygota is Greek in origin, and means "without wings." This subclass contains primitive hexapods that do not fly, and were wingless throughout their evolutionary history. Description: The primitively wingless hexapods undergo little or no metamorphosis. Instead, the larval forms are smaller versions of their adult parents. Apterygotes molt throughout their lives, not just during the growth phase. Some apterygotes, like silverfish, may molt dozens of times and live several years. Three of the five orders classified as Apterygota are no longer considered true insects. Diplurans, proturans, and springtails are now referred to as the entognathous orders of hexapods. The term entognath (ento meaning inside, and gnath meaning jaw) refers to their internal mouthparts. Orders in the Subclass Apterygota: Diplura - diplurans (Entognatha)Protura - proturans (Entognatha) Collembola - springtails (Entognatha)Thysanura - silverfish and firebrats (Insecta)Microcoryphia - jumping bristletails (Insecta) Sources: "Apterygota," by John R. Meyer, Department of Entomology, North Carolina State University. Accessed online October 29, 2015.Hexapod taxonomy lecture slides, by Christopher Brown, Department of Biology, Tennessee Tech University. Accessed online October 29, 2015.Borror and DeLong's Introduction to the Study of Insects, 7th edition, by Charles A. Triplehorn and Norman F. Johnson.