Definitions

A lateral flap on the 2nd maxilla which, by beating within a narrow pump chamber, draws a respiratory stream of water through the branchial chamber (Figs. 3, 10). [Warner, 1977]
A thin lateral lobe on the outer maxilla that assists the pumping of water through the branchial chamber. [Ingle, 1983]
Elongate exopods of the maxillae that vibrate to create ventilating currents through the branchial chambers. [Brusca and Brusca, 2002]
Exopod comprising boat-shaped extension of maxilla opposite endopod. [Moore and McCormick, 1969]
Exopod of maxilla, often used to produce respiratory current in gill chamber. [McLaughlin, 1980]
(Taxon-specific: Order Decapoda) Relatively large outer branch (exopod) of each maxilla. Typically consists of two branches or lobes with setose margins, one of which may extend under carapace to generate respiratory current.
(syn. gill bailer) [Stachowitsch, 1992]