| Porpita is a member of a small but very widespread group of hydrozoan cnidarians, the Chondrophorina. |
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| Getting hooked up with an animal like Donax seemed a very clever trick of hydrozoan evolution. |
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| Many hydrozoan species perform large vertical diel migrations, which may bring individuals together in spawning aggregations. |
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| The pinnacle of hydrozoan colonial complexity can be found in members of the Family Siphonophora. |
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| Moore and Harrington regarded Sphenothallus as a hydrozoan or scyphozoan. |
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| Atomic absorption spectrophotometry has shown that ultratraces of metals are present in the aragonite skeleton of the hydrozoan coral Millepora from a reef flat on the Coral Sea Plateau off Queensland. |
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| The mouth is at the end of a manubrium in many hydrozoan polyps. |
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| Hydra is an unusual hydrozoan genus in that its life cycle lacks any trace of a jellyfish stage, and the polyp stage is solitary rather than colonial. |
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| Several species of warm water hydrozoan cnidarians inhabit body folds of bivalve molluscs as inquiline symbiotes. |
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| The best known freshwater example is the cosmopolitan hydrozoan jellyfish, Craspedacusta sowerbii. |
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| The first occurrence of the paedomorphic derivative hydrozoan Eugymnanthea from Taiwan, with a report of a new host. |
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