Kingdom Animalia (animals) Eumetazoa (metazoans) Bilateria (bilaterally symmetrical animals) Protostomia (protostomes) Ecdysozoa Arthropoda (arthropods) Hexapoda Class Insecta (insects) Order Zygentoma Family Lepidotrichidae (primitive bristletails) Family Lepismatidae (silverfish) Family Nicoletiidae (nicoletiids)
