(Phialidium) (Phialidium) is a biological genus in the family Campanulariidae and order Leptothecatae (Thecate Hydroids).
Phialidium ambiguum
Phialidium bicophorum
Phialidium brunescens
Phialidium chengshanense
Phialidium gardineri
Phialidium iridescens
Phialidium languidum
Phialidium malavensis
Phialidium malayense
Phialidium ovale
Phialidium pacificum
Phialidium rangiroae
Agastra
Billardia
Calamphora
Campanularia
Clytia
Eucalix
Eucopella
Eucuspidella
Gastroblasta
Gonothyraea
Hartlaubella
Laomedea
Obelia
Orthopyxis
Paraculliactis
Phialidium
Rhizocaulus
Silicularia
Tulpa
Verticillina