One of the abdominal legs of a crustacean. See Illust. under Crustacea.

One of the first five paired, biramous, ventral limbs of the pleotelson. In unmodified form, it consists of a basal segment, the protopod, and two distal rami, the endopod and the exopod. The rami may be biarticulate. Female Asellota lack the first pleopods. In male Asellota, the first pleopods are present only as uniramous structures (fused into a single elongate plate in the superfamily Janiroidea). The rami of the male second pleopod are modified as copulatory structures. Pleopods III-V have very thin cuticle and function as gills (branchiae).

one or three anterior paired biramous appendages of the abdomen, consisting of basal peduncle and marginally setose, multisegmented rami

one of the paired abdominal appendages of certain aquatic crustaceans that function primarily for carrying the eggs in females and are usually adapted for swimming

one of a series of small paired appendages attached to the ventral side of the abdomen (tail) of a crustacean; also known as swimmeret; used by female crayfishes to carry their eggs

one of five pairs of appendages on the first five abdominal segments ("swimmerets," or modified into male gonopod).