Silverfish (Lepisma saccharina).
apterygote, Any of the primitive wingless insects, distinct from the pterygotes, or winged insects. The term commonly refers to the primitive insects in the orders Zygentoma (silverfish, fishmoths, and firebrats) and Archaeognatha (bristletails) and the extinct suborder Monura (formerly the thysanurans). The taxonomic status of the various groups is still unsettled.