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Thysanura - bristletails
3/8 in.

Thysanurans possess either two or three hairy, antennae-like appendages (tails) at the end of their abdomens. Bristletails are fast-running, wingless, fish-shaped insects, up to ½-inch long. They have long antennae and chewing mouthparts. They develop without metamorphosis. Most bristletails live outdoors under stones and other objects on the ground. However, the two most common pest species - the silverfish and the firebrat - live in houses where they may feed on book bindings, starched clothing, wallpaper and other materials containing starch or glue.