filamentary appendage

Membranous process developed on body in many cirripeds (Ascothoracica, Lepadomorpha) commonly on bases of cirri; may contain branches of testes; presumed to be respiratory in function [Moore and McCormick, 1969].

Membranous process developed on body in some cirripeds commonly at base of cirrus [McLaughlin, 1980].

(Subclass Cirripedia):

() [Anderson, 1980].

^{Lepas anatifera: left valve removed. [Anderson, 1980]}

(Subclass Cirripedia):

() [Anderson, 1980].

^{Lepas anatifera: cirrus V; cirrus I, and extended cirral fan. [Anderson, 1980]}