[Crustacea] The paired biramous appendages of the isopod pleotelson, representing the appendages of the fused sixth pleonite.

[Amphipoda] (UR; in figures also refers to the entire urosome) the last three abdominal segments bear uropods. Uropods are paired biramous appendages attached laterally to the body. They comprise the basipodite and two branches or rami: an exopodite (outer) and endopodite (inner). The rami are uni-articulate, except in gammarids, where the exopodite of uropod III may be 2-articulated. In hyperiids the endopodite is sometimes fused with the basipodite, and the exopodite reduced (Cystisomatidae, Oxycephalidae, Scinidae). In other cases, parts of the uropod are completely fused or reduced, and the animals have only one petal-like article, rather than a "normal" uropod (Phrosinidae).

Alternative form for Uropods : UR.