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Platyzoa

    The Platyzoa are a group of protostome animals. They include the Platyhelminthes or flatworms, together with several exclusively microscopic phyla:

    The Cycliophora may also belong here. The Platyhelminthes and Gastrotricha are acoelomate. The other phyla have a pseudocoel, and share characteristics such as the structure of their jaws and pharynx, although these have been secondarily lost in the parasitic Acanthocephala. They form a monophyletic subgroup called the Gnathifera.
    The Platyzoa are close relatives of the Lophotrochozoa, and are sometimes included in that group. Together the two make up the Spiralia.