basiperiphallus
From ZooTerms (Dictionary of Invertebrate Zoology)
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basiperiphallus (noun; plural basiperiphalli; Greek basis, base; peri, around; phallos, penis): (Arthropoda: Insecta) In Protura, the basal ring of the periphallus, into which the acroperiphallus is sometimes retracted.
