ala

One of pair of posteriorly directed cephalic-shield extensions; in cirripeds (Balanomorpha), triangular lateral part of compartment plate delimited from paries, which is overlapped by adjacent compartment plate with or without radius. (Pl. alae) [Moore and McCormick, 1969].

(Subclass Branchiura):

One of two posterolateral extensions of carapace. (broad, broadly rounded, narrowly rounded, elongate and coiled behind thorax, greatly elongated; extending to second, third, or fourth thoracomere, to abdomen, beyond abdomen) [Stachowitsch, 1992].

(Subclass Cirripedia):

() [Anderson, 1980].

^{Balanus trigonus: wall plates, exploded; and interior of operculum. [Anderson, 1980]}

(Subclass Cirripedia):

Barnacle plate feature: in unstalked form, triangular lateral part of compartmental plate. Delimited from median part (paries) and overlapped by lateral part (radius) of adjoining compartmental plate [Stachowitsch, 1992].

(Subclass Cirripedia):

One of pair of posteriorly directed cephalic-shield extensions (Branchiura and some parasitic Copepoda); triangular lateral part of compartmental plate, with or without radii, overlapped by adjacent compartmental plate (balanomorph Cirripedia). (Pl. alae) [McLaughlin, 1980].

(Subclass Copepoda):

In parasitic copepod, one of two posterolateral extensions of cephalic shield [Stachowitsch, 1992].

(Class Ostracoda):

Wing-like extension of valve, typically located ventrally and directed posteriorly. (simple, carinate) [Stachowitsch, 1992].