Eukaryota  >  Metazoa  >  Cnidaria  >  Hydrozoa

Order	Family	Genus	Species
Actinulida	2	2	37
Anthoathecata	42	131	1227
Leptothecata	33	133	783
Limnomedusae	5	14	225
Narcomedusae	6	15	60
Siphonophorae	18	55	216
Trachymedusae	3	21	52