[Crustacea] One of the paired posterior-most appendages of the body.

[Crustacea: Brachyura larvae] The forked end of the abdomen in zoeal stages.

[Crustacea: Ostracoda] The furca in Myodocopida is situated dorsal to the anus and is, therefore, considered to be a uropod, whereas in the Podocopida in which the furcae are ventral to the anus they are considered to be a telson.

Alternative form for Furca : Furcae (pl.).