All vertebrates are chordates but not all chordates are vertebrates. Why?

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Protochordates are invertebrate chordates

Cephalochordates do not have a dorsal tubular nerve cord

In urochordates, notochord is confined to the larval tail

Notochord is replaced by vertebral column in adult stage of all chordates

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Detailed Solution

Phylum Chordata includes protochordates (urochordates and cephalochordates) and vertebrates.

Protochordates have a notochord (at least at some stage of their life) but lack a vertebral column.

Vertebrates possess notochord during the embryonic period.

The notochord is replaced by a vertebral column in the adult.

So, all vertebrates are chordates (have a notochord).

Protochordates are not vertebrates (lack a vertebral column). Hence, not all chordates are vertebrates.

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