Uropod

Uropods are posterior appendages found on a wide variety of crustaceans.

Uropods are often defined as the appendages of the last body segment of a crustacean.

[1] Under this latter definition, the appendages of the anal segment are caudal rami, which are analogous to uropods.

The exopod is typically the larger, and may be divided in two by a transverse suture known as the diaeresis.

[2][3] The uropods may work in concert with the telson to form a "tail fan".