Definitions

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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]
(Taxon-specific: 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]
Balanus trigonus: wall plates, exploded; and interior of operculum. [Anderson, 1980]
(Taxon-specific: Subclass Cirripedia) (Figure only.) [Anderson, 1980]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: Subclass Copepoda) In parasitic copepod, one of two posterolateral extensions of cephalic shield. [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) Wing-like extension of valve, typically located ventrally and directed posteriorly. (simple, carinate). [Stachowitsch, 1992]