Answer :


Phylum chordates are the animals with backbones. This phylum derives its name from one of the common characteristics of this group namely the notochord.


i. Prochordates are considered as the development of vertebrata.


As they do not have brain, hence they are referred as Acrania.


ii. These are divided into three sub-pylums which are Hemichordata, Cephalochordata and Urochordata.


Hemichordata


i. These are marine organisms.


ii. They do not have backbones.


iii. The body is soft, bilateral symmetrical and unsegmented.


Cephalochordata


i. These are small fish.


ii. These are marine organisms with unpaired dorsal fin.


Urochordata


i. The adults are mostly degenerate, and are sessile forms.


ii. The body is enveloped by a tunic or test.


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