Siphonophorae
Order within Hydrozoa
Abylidae
Agalmatidae
Apolemiidae
Clausophyidae
Cordagalmatidae
Diphyidae
Erennidae
Forskaliidae
Hippopodiidae
Physaliidae
Physophoridae
Prayidae
Pyrostephidae
Resomiidae
Rhizophysidae
Rhodaliidae
Sphaeronectidae
Stephanomiidae
Tottonophyidae