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Eumetazoa (metazoans)
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Class Hydrozoa
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Order Leptothecata
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Family Aequoreidae
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Family Aglaopheniidae
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Family Barcinididae
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Family Blackfordiidae
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Family Bonneviellidae
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Family Campanulariidae
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Family Campanulinidae
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Family Cirrholoveniidae
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Family Clathrozoidae
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Family Dipleurosomatidae
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Family Eirenidae
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Family Haleciidae
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Family Halopterididae
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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 Lineolariidae
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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 Octocannoididae
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Family Orchistomidae
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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 Sugiuridae
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Family Syntheciidae
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Family Teclaiidae
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Family Thecata incerta sedis
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Family Thyroscyphidae
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Family Tiarannidae
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