(Order Cumacea):
Term applied to epipods of first maxilliped pair (or, in an alternate interpretation, to epipods and exopods). Modified for respiration, the posteriorly directed part extending into branchial cavity and bearing branchial lobules, the anteriorly directed part ("exopod") forming part of exhalant cephalon [Stachowitsch, 1992].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.