How large are adult bristletails?

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When fully grown, adult bristletails (order Archaeognatha) typically measure between 5 and 20 mm (0.2 to 0.8 inch) in length.12

While the term "bristletail" has historically been used to describe various wingless insects, it is now specifically associated with the order Archaeognatha. These insects are characterized by their three slender, bristlelike appendages at the tip of the abdomen.1