From ZooTerms (Dictionary of Invertebrate Zoology)
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Nemertea also nemerteans, nemertines or rhynchocoels (noun, plural; Greek Nemertes, a nereid, sea nymph): A phylum of unsegmented, bilaterally symmetrical acoelomate worms, commonly called ribbon worms, that are predatory carnivores or scavengers that frequently use their eversible proboscis to catch prey.