From ZooTerms (Dictionary of Invertebrate Zoology)
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juxta (noun; Latin juxta, near): (Arthropoda: Insecta) 1. In Diptera, an eversible membranous distal section of the male intromittent organ. 2. In male Lepidoptera, a sclerotized plate at the base of the aedeagus; sometimes connected to the anellus by a thin median process that is often forked so as to surround the aedeagus; has been used as a synonym of the anellus of the aedeagal fulcrum.