| 21. | A cousin of the jellyfish, hydroids have two major life stages, one sedentary and one drifting.
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| 22. | On the vertical surfaces there are clusters of hydroids, and plumose anemones on the more exposed rocks.
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| 23. | Barnes found a variety of organisms attached to the debris, including barnacles, mollusks, worms and hydroids.
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| 24. | The form of the hydroid is very variable and this was one of the reasons for the taxonomical confusion.
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| 25. | The hydroids devour the small crustaceans called copepods on which fish larvae feed, depriving them of their food source.
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| 26. | It was also found feeding on an unidentified species of hydroid in Panama, on which it is extremely cryptic.
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| 27. | Modifications appear in the shapes of some these hydroids, for example smaller tentacles or encrustation of the roots by bryozoans.
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| 28. | "' Bougainvilliidae "'is a family of marine hydroids in the genera and about ninety three species.
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| 29. | The hydroids may have been ripped from their ocean-floor moorings by seasonal storms or by commercial trawlers, Bollens said.
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| 30. | A rare crab " Pirimela denticulata " and hydroid " Tamarisca tamarisca " both live in the bay.
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