Phylum Chordata is a diverse group of animals that possess a notochord, dorsal nerve cord, pharyngeal slits, and a post-anal tail at some point in their life cycle. This phylum includes familiar animals such as fish, amphibians, reptiles, birds, and mammals. Chordates are bilaterally symmetrical and have a closed circulatory system. They also have a well-developed brain and a complex nervous system. The notochord provides support and flexibility, while the pharyngeal slits are used for filter feeding or gas exchange. The post-anal tail is used for locomotion in aquatic species. Chordates are found in a variety of habitats, from the deep sea to freshwater streams and terrestrial environments.

Phylum chordates