gills; branchia; angle of the mandible; gonial angle
gill lamella; branchial lamella; gill filament
chin; jaw; gills; branchia
gill slit; pharyngeal slit
sea pen (any coelenterate of the family Pennatulidae or related families); sea feather
lamellibranches (i.e. bivalves)
enteropneusts (hemichordates of class Enteropneusta)
pterobranchs (hemichordates of class Pterobranchia)
branchial arch; gill arch
Heterobranchia; clade of snails and slugs
jawbone; mandible; branchial arches (in fish); gill arches
gill plate; branchial plate; gill lamella; branchial lamella
gill sac; branchial sac; branchial pouch; inner branchial groove; pharyngeal pouch