Answer : Vertebrata : These animals have a true vertebral column and internal skeleton, allowing a completely different distribution of muscle attachment points to be used for movement. Vertebrates are bilaterally symmetrical, triploblastic, coelomic and segmented, with complex differentiation of body tissues and organs. All chordates possess the following features:
(i) They have a notochord
(ii) They have a dorsal nerve cord
(iii) They are triploblastic
(iv) They have paired gill pouches
(v) They are coelomate.
Vertebrates are grouped into five classes
(i) PISCES (ii) AMPHIBIA (iii) REPTILIA (iv) AVES (v) MAMMALIA
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