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How old are insects?

The most primitive living insects are thought to be bristletails (see below), also called jumping bristletails, which are placed in the Order Archaeognatha (Class Insecta) (Grimaldi & Engel, 2012). These primitive little wingless insects – not to be confused with silverfish (Zygentoma), which are also very old – have persisted since at least the mid-Devonian epoch (398–385 million years ago…