Which extant chordates are postulated to be most like the earliest chordates in physical appearance?

Question

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Lancelets, also known as amphioxus, are considered to be the extant chordates that are most like the earliest chordates in terms of physical appearance. They have a fish-like shape with a notochord running down their backs and a brain that is similar in structure to the primitive brains of early chordates. Adult tunicates, on the other hand, have a very different body plan from early chordates, while amphibians, reptiles, and chondrichthyans are all vertebrates that evolved much later than the earliest chordates.

Which Extant Chordates Are Postulated to Be Most Like the Earliest