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are the largest animals to swim with cilia, with adult ctenophores range from a few millimeters to 1.5 m in size depending on the species. Their bodies consist of a mass of jelly (mesoglea) with a two-cell-thick layer on the outside, and another lining the internal cavity. The phylum has a wide range of body forms, including the egg-shaped cydippids with a pair of retractable tentacles

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