Composed of thin capillary-bearing filaments, their chambers also contain "rakers" which direct solid particles into the esophagus.
The bones which support them are called cleithra, and the space between one and the rest of the head is called an isthmus. Mollusks have equivalent organs called ctenidia, and in more advanced creatures, they are covered by an operculum. Composed of thin capillary-bearing filaments, their chambers also contain "rakers" which direct solid particles into the esophagus. FTP, name this organs which take oxygen from the water, possessed by many aquatic animals.
The bones which support them are called cleithra, and the space between one and the rest of the head is called an isthmus.
gills