from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. any of the numerous minute canals lined with choanocytes which radiate from the paragastric cavity in some sponges and end just below the surface of the sponge
  • n. any of the canals extending through the substance of the umbrella from the gastric cavity to the marginal circular canal in jellyfish
  • n. a tube extending outward along each ambulacral area from the circumoral canal in most echinoderms


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