branchial sac

branchial sac

[′braŋ·kē·əl ′sak]
(invertebrate zoology)
In tunicates, the dilated pharyngeal portion of the alimentary canal that has vascular walls pierced with clefts and serves as a gill.
Mentioned in ?
References in periodicals archive ?
Branchial sac without internal longitudinal folds 3 Branchial sac with four or more prominent 4 internal longitudinal folds 3.