The periproct is the final body segment in annelid worms. The anus is located on this segment. The term also refers to the small region surrounding the anus of the sea urchin.
- ↑ 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.
- ↑ Fox, Richard. "Invertebrate Anatomy OnLine". Lander University. Retrieved May 13, 2012.