👉 In the context of zoology, azygobranchia refers to certain species of fish that have developed specialized structures for feeding on planktonic organisms. These structures include gills, which are primarily used for extracting oxygen from the water and producing nitrogen gas, and a mouth with sharp teeth or claws, which help in tearing through the tissues of plankton. Azygobranchia are often found in bodies of water that lack sufficient nutrients to support larger fish, such as