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Biological Environment > Protostomia |
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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 molluscs, arthropods and annelid worms belong is called the Protostomia.
Protostomia means "first mouth", so called because the mouth develops from the first opening into the gut (blastopore). The body cavity or coelom forms from a split in the embryonic middle tissue (mesoderm ). The larvae of Protostomes are called trochophores. Contrast this with the other major group of animals, the Deuterostomia. |
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Biological Environment > Protostomia |
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Basic Information |
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