Phylum Chordata. A.K.A. Chordates. Four Distinguishing Features. Single, hollow, dorsal nerve cord Gill or pharyngeal slits (small openings along anterior part of body or pharynx) Notochord: flexible rod for support that lies between the nerve cord and gut
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Include: fish, reptiles, birds and mammals
1) Class Agnatha: Jawless fish
2) Class Chondrichthyes: cartilaginous fish
3) Class Osteichthyes: bony fish
Examples: hagfish and lampreys
Includes: Sharks, Rays, Skates, and Ratfish