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The group of animals to which the vertebrates belong is called the deuterostomia.
Deuterostome means "second mouth", so called because the mouth develops from the second opening into the embryonic gut. The first opening (the blastopore) develops into the anus. The body cavity (coelom) develops from buds off the gut. Compare this with the other major group of animals, the Protostomia. As well as the vertebrates, this group includes starfish and sea urchins (Echinodermata), arrowworms (Chaetognatha) and lamp shells (Brachiopoda). |
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Biological Environment > Deuterostomia
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Click here to read Time Crystal, history of the Universe as sci-fi fantasy romance!
