The periproct is the final body segment in annelid worms. The anus is located on this segment.[1] The term also refers to the small region surrounding the anus of the sea urchin.[2]
^Sims, R & Gerard, B (1985). Earthworms: Keys and Notes for the Identification and Study of the Species. London: Published for The Linnean Society of London and the Estuarine and Brackish-Water Sciences Association by E. J. Brill/Dr. W. Backhuys. p. 3.
