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Hydroids (Hydrozoa)
Species Count: 117
Abylidae
Aglaopheniidae
Bougainvilliidae
Campanulariidae
Cirrholoveniidae
Cladocorynidae
Cladonematidae
Cordylophoridae
Corynidae
Diphyidae
Eudendriidae
Geryoniidae
Haleciidae
Halicreatidae
Halopterididae
Hydractiniidae
Hydridae
Kirchenpaueriidae
Lafoeidae
Milleporidae
Oceaniidae
Olindiidae
Pandeidae
Pennariidae
Physaliidae
Plumulariidae
Porpitidae
Proboscidactylidae
Ptilocodiidae
Rathkeidae
Rhopalonematidae
Sertulariidae
Solanderiidae
Sphaerocorynidae
Stylasteridae
Syntheciidae
Thyroscyphidae
Tubulariidae
Zancleidae