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Why are thrips sometimes called bladder feet?

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Detailed illustration of a western flower thrips, Frankliniella occidentalis, showing its elongated yellow-brown body, six legs, and two pairs of fringed wings spread outward. — thrips Western flower thrips (*Frankliniella occidentalis*).

Thrips are sometimes referred to as "bladder feet" because adult members of the order Thysanoptera possess extensible bladders located on the tarsi of their legs.12