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1.Notochord is present in all chordates during sometime of development, it is formed on the dorsal side of the primitive gut in the early embryo stage.
Brain is set inside a bony box, known as cranium.
All vertebrates have a heart and closed circulatory system.
The endoskeleton is made of cartilage or bone.
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they have a true vertebral column and internal skeleton bilaterally symmetrical triploblastic coelomic and segmented with Complex differentiation of body tissue they have notochord ,dorsal nerve cord, triploblastic , paired gilled pouches, and coelomate
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