The chordates that are not vertebrates are: (1) lancelets and tunicates.
Chordates are the organisms that belong to the phylum Chordata of Kingdom Animalia. The characteristics that separate them from rest of the organism are: a notochord, a dorsal hollow nerve cord, pharyngeal slits, etc. These characters sometime definitely appear at some stage of the development of an animal.
Vertebrates are the animals that definitely possess a vertebral column or backbone for their whole life. The backbone is composed of several small bones joined together to provide a perfect posture to the body. The example of vertebrates are: amphibians, reptiles, birds, and mammals.
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