- acroperiphallus
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n.; pl. -li [Gr. akros, tip; peri, around; phalos, penis](ARTHROPODA: Insecta)In Protura, the distal part of the periphallus, sometimes retractable into basiperiphallus.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.