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Formation of an embryonal coeloms (Schizocoelie Protostomia)

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Regnum: Animalia

Embryology.The protostomia (= first mouth) develops from the first opening into the gut (blastopore). The body coelom (= cavity) forms from a split (schizo) in the embryonic mesoderm (middle tissue). The group of animals belonging to the Protostomia are: molluscs, arthropods and annelids.