From ZooTerms (Dictionary of Invertebrate Zoology)
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Ctenophora also ctenophores (noun, plural; Greek kteis, comb; phoreus, bearer): A phylum of marine coelenterates commonly called sea walnuts or comb jellies, that are free swimming and biradially symmetrical with 8 rows of fused ciliary plates (combs or ctenes) at some stage of their life.