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Animals of the phylum chordata include vertebrates and several closely related invertebrates.

All chordates have the following characteristics at some point in their lives :

1.notochord-cartilaginous rod running underneath, and supporting, the nerve cord. In vertebrates , it develops into the vertebral column.

2. Dorsal tubular nerve chord a bundle of nerve fibers which runs down the "back". It connects the brain with the lateral muscles and other organs.

3.Pharyngeal pouches-openings through which water is taken into the pharynx, or throat.

4.Endosytle-is a longitudinal ciliated groove on the ventral wall of the pharynx which produces mucus to gather food particles.

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10y ago

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