(Obelia) (Obelia) is a biological genus in the family Campanulariidae and order Leptothecatae (Thecate Hydroids).
Obelia bidentata
Obelia geniculata
Obelia alternata
Obelia biserialis
Obelia castellata
Obelia dubia
Obelia longissima
Obelia multidentata
Obelia plicata
Obelia racemosa
Obelia dichotoma
Agastra
Billardia
Calamphora
Campanularia
Clytia
Eucalix
Eucopella
Eucuspidella
Gastroblasta
Gonothyraea
Hartlaubella
Laomedea
Obelia
Orthopyxis
Paraculliactis
Phialidium
Rhizocaulus
Silicularia
Tulpa
Verticillina