gills; branchia; angle of the mandible; gonial angle
branchial respiration (breathing using gills)
jawbone; mandible; branchial arches (in fish); gill arches
gill slit; pharyngeal slit
gill sac; branchial sac; branchial pouch; inner branchial groove; pharyngeal pouch
sea pen (any coelenterate of the family Pennatulidae or related families); sea feather