Protostomia (from the Greek: mouth first) are a clade of animals. Together with the deuterostomes and a few smaller phyla, they make up the Bilateria, mostly comprising animals with bilateral symmetry and three germ layers. The major distinctions between deuterostomes and protostomes are found in embryonic development. Image:Mantell's Iguanodon restoration.jpg This article is a . You can help My English Wiki by expanding it.
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