Eukaryota  >  Metazoa  >  Cnidaria  >  Hydrozoa

Order	Family	Genus	Species
Actinulida	2	2	37
Anthoathecata	42	131	1235
Leptothecata	33	133	801
Limnomedusae	5	14	226
Narcomedusae	6	15	60
Siphonophorae	18	56	225
Trachymedusae	3	21	52