Metazoa
From ZooTerms (Dictionary of Invertebrate Zoology)
Metazoa (noun, plural; Greek meta, after; zoon, animal): 1. A small phylum of endoparasitic, ciliated, multicellular organisms composed of two layers, lacking skeletal, muscular, nervous, digestive, respiratory or excretory elements.
2. Often regarded as degenerate flatworms appended to phylum Platyhelminthes.
