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Cnidaria

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Cnidaria /Cni·da·ria/ (ni-dar´e-ah) a phylum of marine invertebrates including sea anemones, hydras, corals, jellyfish, and comb jellies, characterized by a radially symmetric body bearing tentacles around the mouth.
Cnidaria
a phylum of lowly animals including hydroids and hydromedusae (class Hydrozoa), true jellyfish and free-swimming medusae (class Scyphozoa) and sea anemones, sea pens and corals (class Anthozoa). Previously called Coelenterata and that name is still widely used.
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It's looking like a general rule that most of the genes that are fairly widely distributed in metazoa do exist in Cnidaria [hydralike organisms]," Grens concludes.
Human homologues in the humble hydra by Pennisi, Elizabeth / Science News
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