Phylum Chordata. Characteristics of Chordates. Notochord Dorsal nerve cord Pharyngeal pouches or gill slits Postanal tail. Subphylum Cephalocharodata- This subphylum is composed of about 2 dozen blade-shaped animals known as lancelets. They retain all characteristic throughout life.
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Subphylum Urochordata- This subphylum is commonly known as tunicates ( sea squirts). Larva posses all chordate characteristics while adults exhibit only Pharyngeal pouches.