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Caddisflies look very much like small moths. Depending on the species, they range from 4 mm to 4 cm in length. They have long slender antennae and vestigial mouthparts that enable them to ingest liquid food only.

Two pairs of dark membranous wings, which are folded roof-like over the abdomen when at rest, are located on the thorax. The wings are covered with tiny hairs that give them a downy look.

The cylindrical abdomen usually tapers off to a pair of appendages in females and to at least two pairs in males.

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