Physonectae

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Phylum: Cnidaria
Cladus: Medusozoa
Classis: Hydrozoa
Ordo: Siphonophora
Subordo: Physonectae
Familiae: Agalmatidae - Apolemiidae - Athorybiidae - Erennidae - Forskaliidae - Physophoridae - Pyrostephidae - Rhodaliidae

Reference

http://www.ville-ge.ch/mhng/hydrozoa/sipho/physonectae.htm