A) Chondrichthyes
B) Cyclostomata
C) Loa loa
D) None of these
Correct Answer: B
Solution :
Notochord develops invariably from the dorsal wall of archenteron as a thickening or upfolding. Cyclostomata have a persistent notochord through out of life. Vertebral column is small imperfect neural archs over the notochord.
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