The Phylum Ctenophora

Comb jellies or sea walnuts

about 100 species
Like hydroids, comb jellies have two layers of cells, but they do not exist as either polyps or medusae. Most of them are round, and they live in surface waters, swimming by means of cilia. Some have a pair of tentacles bearing adhesive cells which produce a sticky secretion used in catching the small floating animals on which the comb jellies feed

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