One of two appendages of each abdominal somite (pleomere); typically consists of base (protopod) and two branches (endopod, exopod). Serves in swimming or variously modified as copulatory structures (e.g., gonopod) in males, egg-brooding structures in females.
(M. Stachowitsch, 1992)

Alternative forms for pleopod : Pl 1, Pl 2, pleopods, swimmeret.