one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes