[Crustacea: Euphausiacea/Brachyura)] Paired appendade on sixth abdominal somite ( = pleopod 5).

[Crustacea 2] The appendages of the sixth pleon segment are known as uropods. They are flat and leaf-like and, with the telson, make up the "tail-fan" of the animal.

[Crustacea 3] One of the pair of pleopods of the sixth abdominal somite. In contrast to the pleopods of the preceding somites, the uropods are stiff and heavily chitinized; they are well developed and form, together with the telson, the tail fan. They consist of an unsegmented peduncle, which bears at its distal end the usually blade-shaped exo- and endopods, these can be folded against each other and sometimes under the telson (hence the name tail fan).