After “Wikispecies”, 2008

<==o Conica [Hydroida: Leptomedusae in partim]
   |--o Aequoreidae [Hydroida: Leptomedusae]
   |  `-- Aequorea pensilis Péron & Lesueur, 1809
   |--o Aglaopheniidae
   |  |-- Aglaophenia cupressina
   |  |-- Cladocarpus
   |  |-- Gymnangium
   |  |-- Lytocarpia
   |  |-- Macrorhynchia
   |  |-- Nematocarpus
   |  `-- Streptocaulus
   |--o Barcinididae
   |  `-- Barcino
   |--o Blackfordiidae
   |  `-- Blackfordia
   |--o Campanulinidae [Hydroida: Leptomedusae]
   |  |-- Calycella
   |  |-- Campomma
   |  |-- Cuspidella
   |  |-- Egmundella
   |  |-- Lafoeina
   |  |-- Opercularella
   |  `-- Tetrapoma
   |--o Dipleurosomatidae
   |  |-- Cuvieria
   |  `-- Dipleurosoma
   |--o Eirenidae Haeckel, 1879 [Hydroida: Leptomedusae]
   |  |-- Campanopsis
   |  |-- Eirene
   |  |-- Eugymnanthea
   |  |-- Eutima
   |  |-- Eutonina
   |  |-- Helgicirrha
   |  |-- Irenium
   |  |-- Neotima
   |  |-- Phialopsis
   |  `--o Tima Eschscholtz, 1829
   |     |-- T. bairdi
   |     |-- T. flavilabris
   |     |-- T. formosa (L. Agassiz, 1862)
   |     |-- T. lucullana
   |     `-- T. saghalinensis
   |--o Eucheilotidae
   |  `--o Eucheilota
   |     |-- E. flevensis
   |     |-- E. maasi
   |     |-- E. maculata
   |     |-- E. paradoxica
   |     `-- E. ventricularis
   |--o Haleciidae [Hydroida: Leptomedusae]
   |  |-- Campalecium
   |  |-- Halecium
   |  |-- Hydranthea
   |  `-- Hydrodendron
   |--o Halopterididae
   |  |-- Antennella
   |  |-- Halopteris
   |  |-- Monostaechas
   |  `-- Schizotricha
   |--o Kirchenpaueriidae
   |  |-- Kirchenpaueria
   |  |-- Ophinella
   |  |--o Oswaldella Stechow, 1919
   |  |  |-- O. herwigi
   |  |  `-- O. laertesi
   |  `-- Ventromma
   |--o Lafoeidae [Hydroida: Leptomedusae]
   |  |-- Acryptolaria
   |  |-- Anthohebella
   |  |-- Bedotella
   |  |-- Cryptolarella
   |  |-- Filellum
   |  |-- Grammaria
   |  |-- Hebella
   |  |-- Lafoea
   |  |-- Scandia
   |  `-- Zygophylax
   |--o Laodiceidae [Hydroida: Leptomedusae]
   |  |-- Krampella
   |  |-- Laodicea
   |  |-- Melicertissa
   |  |-- Ptychogena
   |  |-- Staurodiscus
   |  |-- Teclaia
   |  `-- Toxorchis
   |--o Lovenellidae [Hydroida: Leptomedusae]
   |  `-- Lovenella
   |--o Malagazziidae
   |  `-- Octophialucium
   |--o Melicertidae [Hydroida: Leptomedusae]
   |  |-- Melicertum
   |  `-- Orchistomella
   |--o Mitrocomidae [Hydroida: Leptomedusae]
   |  |-- Cosmetira
   |  |-- Cyclocanna
   |  |-- Foersteria
   |  |-- Halopsis
   |  |-- Mitrocoma
   |  |-- Mitrocomella
   |  |-- Mitrocomium
   |  |-- Octogonade
   |  `-- Tiaropsidium
   |--o Orchistomidae
   |  `-- Orchistoma
   |--o Phialellidae [Hydroida: Leptomedusae]
   |  `-- Phialella quadrata
   |--o Plumulariidae [Hydroida: Leptomedusae]
   |  |-- Monotheca
   |  |-- Nematophorus
   |  |-- Nemertesia
   |  |-- Plumularia
   |  |-- Polyplumaria
   |  `-- Pseudoplumaria
   |--o Sertulariidae Lamouroux, 1812 [Hydroida: Leptomedusae]
   |  |--o Abietinaria Kirchenpauer, 1884
   |  |  `-- A. abietina
   |  |-- Amphisbetia
   |  |-- Diphasia
   |  |-- Dynamena
   |  |-- Hydrallmania
   |  |-- Pasya
   |  |-- Salacia
   |  |-- Selaginopsis
   |  |-- Sertularella
   |  |-- Symplectoscyphus
   |  |-- Tamarisca
   |  `-- Thuiaria
   |--o Syntheciidae [Hydroida: Leptomedusae]
   |  `-- Synthecium
   |--o Tiarannidae [Hydroida: Anthomedusae:]
   |  |-- Modeeria
   |  |-- Stegolaria
   |  `-- Tiaranna
   `--o Tiaropsidae
      |-- Tiaropsidium
      `-- Tiaropsis multicirrata

Reference(s):