First slide

Classification of Animals

Question

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

Moderate

A

Protochordates are invertebrate chordates
B

Cephalochordates do not have a dorsal tubular nerve cord
C

In urochordates, notochord is confined to the larval tail
D

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

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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