Abylidae

Acaulidae

Actinulidae

Aeginidae

Aequoreidae

Agalmatidae

Anthoathecata

Anthomedusae

Apolemiidae

Armorhydridae

Athecata

Athorybiidae

Australomedusidae

Balellidae

Blackfordiidae

Boeromedusidae

Bonneviellidae

Boreohydridae

Bougainvilliidae

Bythotiaridae

Calycophorae

Calycopsidae=Bythotiaridae

Campanulariidae

Campanulinidae

Candelabridae

Capitata

Cirrholoveniidae

Cladocorynidae

Cladonematidae

Clathrozoidae

Clausophyidae

Conica

Corymorphidae

Corynidae

Cuninidae

Cystonectae

Cytaeididae

Dipleurosomatidae

Eirenidae

Erennidae

Eucheilotidae=Lovenellidae

Eucodoniidae

Filifera

Forskaliidae

Geryoniidae

Gymnoblastea

Halammohydridae

Halammohydroida

Haleciidae

Halicreatidae

Halimedusidae

Hebellidae

Hippopodiidae

Hydractiniidae

Hydridae

Hydroidolina

Lafoeidae

Laingiidae

Laodiceidae

Leptolinae=Hydroidolina

Leptomedusae

Leptothecata

Limnomedusae

Lovenellidae

Malagazziidae

Margelopsidae

Melicertidae

Microhydrulidae

Milleporidae

Mitrocomidae

Moerisiidae

Monobrachiidae

Narcomedusae

Oceaniidae

Olindiasidae

Orchistomatidae

Otohydridae

Pandeidae

Paracorynidae

Pennariidae

Petasidae

Phialuciidae

Physaliidae

Physonectae

Physophoridae

Plumularoidea

Polyorchidae

Polypodium

Porpitidae

Prayidae

Proboscidactylidae

Proboscoida

Protiaridae

Protohydridae

Ptilocodiidae

Ptychogastriidae

Pyrostephidae

Rathkeidae

Rhizophysidae

Rhodaliidae

Rhopalonematidae

Russelliidae

Sertularoidea

Siphonophorae

Solanderiidae

Solmarisidae

Sphaerocorynidae

Sphaeronectidae

Stylasteridae

Sugiuridae

Syntheciidae

Teclaiidae

Teissieridae

Thecata

Tiarannidae

Trachylinae

Trachymedusae

Trichydridae

Tricyclusidae

Tubulariidae

Tubiclavoididae

Zancleidae

Zancleopsisidae