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Dictionary of ichthyology
- 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
branchial sac

gill pouch (the sac containing the gills and communicating with the mouth cavity and with the exterior in Myxini and Petromyzontiformes). Also called ear sac and probably meant to be any pouch or sac surrounding the gills in fishes generally

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