: Zygentoma.

The bristletails constitute the most basal order within the dicondylic insects (Dicondylia). The bristletails are primitively wingless, and share many traits with the jumping bristletails (Archaeognatha), which constitute the sister group to all other insects.

Bristletails Zygentoma
Creative Commons Attribution | Hallvard Elven | Leif Aarvik | Natural History Museum, University of Oslo