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Biological Environment > Deuterostomia |
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This site tells the story of the history of the universe. Click Earlier and Later to follow the story. Note: Many facts have been simplified to make them easier to understand. |
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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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