Order Hydroida
(medusae)

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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.

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  Kingdom Animalia (animals)
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  Eumetazoa (metazoans)
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  Phylum Cnidaria (cnidarians)
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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