Order Hydroida
(medusae)

Scientific names for Aves taxonomy (family and below) are from The Howard and Moore Complete Checklist of the Birds of the World, Princeton University Press, copyright 2003. Used by permission.

• Parent taxa
  
  
  
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  Class Hydrozoa (hydralike animals, hydroids, and hydrozoans)
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  Order Hydroida (medusae)
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  Suborder Anthomedusae (athecate hydroids)
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  Family Acaulidae
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  Family Bougainvilliidae
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  Family Calycopsidae
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  Family Candelabridae
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  Family Cladocorynidae
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  Family Cladonematidae
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  Family Clavidae
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  Family Corymorphidae
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  Family Corynidae
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  Family Cytaeididae
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  Family Eleutheriidae
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  Family Eudendriidae
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  Family Halocordylidae
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  Family Hydrocorynidae
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  Family Margelopsidae
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  Family Myriothelidae
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  Family Pandeidae
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  Family Pennariidae
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  Family Polyorchidae
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  Family Rathkeidae
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  Family Russelliidae
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  Family Solanderiidae
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  Family Tiarannidae
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  Family Tubulariidae
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  Family Zancleidae
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  Suborder Hydrida
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  Family Armorhydridae
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  Family Hydridae
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  Family Protohydridae
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  Suborder Leptomedusae (thecate hydroids)
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  Family Aequoreidae
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  Family Bonneviellidae
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  Family Calycellidae
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  Family Campanulariidae
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  Family Campanulinidae
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  Family Dipleurosomatidae
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  Family Eirenidae
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  Family Eutimidae
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  Family Haleciidae
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  Family Hebellidae
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  Family Kirchenpaueriidae
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  Family Lafoeidae
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  Family Laodiceidae
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  Family Lovenellidae
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  Family Malagazziidae
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  Family Melicertidae
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  Family Mitrocomidae
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  Family Phialellidae
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  Family Phialuciidae
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  Family Plumulariidae
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  Family Sertulariidae
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  Family Syntheciidae
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  Family Timoididae
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  Family Zygophylaxidae
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  Suborder Limnomedusae
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  Family Hydrolariidae
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  Family Limnocnididae
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  Family Microhydridae
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  Family Moerisiidae
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  Family Monobrachiidae
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  Family Olindiidae
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  Family Proboscidactylidae