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Vertebrates are members of a sub-phylum of chordates, characterised by a spine which protects the notochord.

The Subphylum Vertebrata includes reptiles, mammals, fish and birds.

The vertebrate fossil record begins with the appearances of Myllokunmingia fengjiaoa and Haikouichthys ercaicunensis<ref> Author unknown. nd. Lower Cambrian vertebrates from south China Nature ', November 4 1999.  [Full text]</ref> in the Cambrian period (of China, respectively).

References

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