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This page is out of date. Click here to visit our new site. 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. Useful LinksClick for Further information about Protostomia Other History of the Universe Pages News about History of the Universe |
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