Gnathostomulida

From ZooTerms (Dictionary of Invertebrate Zoology)
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Gnathostomulida (noun; Greek gnathos, jaw; stoma, mouth): A phylum of microscopic, free-living marine worms that are acoelomate bilateria with a mono-ciliated skin epithelium, jaws and a muscular pharyngeal apparatus; commonly called jaw-worms.