what is the difference between hemichordata and chordata?

Hemichordates Chordates
1 They are exclusively marine and small forms and primitive in nature 1 These are found in all type of environments and include small as well as large forms,these are advanced
2 Brain, cranium, vertebral column,jaws and paired appendages are absent 2 They process brain,cranium ,vertebral column jaws.
3 Body is vermiform and have a large proboscis 3 They have a well formed body with a skeletal system and muscles attached
4 They do not have a notochord 4 These have a notochord

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