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.
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References in periodicals archive ?
Branchial sac without internal longitudinal folds 3 Branchial sac with four or more prominent 4 internal longitudinal folds 3.
Excess water is pumped from the pharynx through the gill slits, into the branchial sac, and through the gill pore to the outside (Fig.
4 [micro]m , and the largest size to pass through the gill slits, branchial sac, and gill pore was 5.