Click the links to browse through the WoRMS marine species taxonomy.
Animalia
  Mollusca
  Porifera
  Platyhelminthes
  Nematoda
  Annelida
  Nemertina
  Arthropoda
  Ctenophora
  Cnidaria
    Anthozoa
    Hydrozoa
      Hydroidolina
        Siphonophorae
        Anthoathecata
        Leptothecata
          Conica
            Aglaopheniidae
            Campanulinidae
            Haleciidae
                Campalecium
                Haleciella
                Halecium
                  Halecium articulosum
                  Halecium banyulense
                  Halecium beanei
                  Halecium birulai
                  Halecium conicum
                  Halecium corrugatum
                  Halecium curvicaule
                  Halecium delicatulum
                  Halecium groenlandicum
                  Halecium halecium
                  Halecium labrosum
                  Halecium lankesterii
                  Halecium liouvillei
                  Halecium mediterraneum
                  Halecium minimum
                  Halecium minutum
                  Halecium muricatum
                  Halecium nanum
                  Halecium ornatum
                  Halecium petrosum
                  Halecium profundum
                  Halecium pusillum
                  Halecium reflexum
                  Halecium robustum
                  Halecium sessile
                  Halecium tenellum
                  Halecium undulatum
                  Halecium schneideri
                  Halecium irregulare
                  Halecium kuekenthali
                  Halecium beanii
                  Halecium scutum
                  Halecium antarcticum
                  Halecium gracile
                  Halecium incertus
                  Halecium secundum
                  Halecium plumosum
                  Halecium ovatum
                  Halecium textum
                  Halecium corrugatissimum
                  Halecium amphibolum
                  Halecium annulatum
                  Halecium bermudense
                  Halecium brashnikowi
                  Halecium bruniensis
                  Halecium capillare
                  Halecium crinis
                  Halecium cymiforme
                  Halecium cymosum
                  Halecium densum
                  Halecium dichotomum
                  Halecium diminutivum
                  Halecium dubium
                  Halecium dufresnae
                  Halecium dyssymetrum
                  Halecium exiguum
                  Halecium expansum
                  Halecium fasciculatum
                  Halecium filicula
                  Halecium fjordlandicum
                  Halecium flabellatum
                  Halecium flexum
                  Halecium fragile
                  Halecium fraseri
                  Halecium fruticosum
                  Halecium galeatum
                  Halecium harrimani
                  Halecium humile
                  Halecium inhacae
                  Halecium insolens
                  Halecium interpolatum
                  Halecium jaederholmi
                  Halecium kofoidi
                  Halecium labiatum
                  Halecium laeve
                  Halecium lankesteri
                  Halecium lenticulare
                  Halecium lightbourni
                  Halecium linkoi
                  Halecium lucium
                  Halecium luteum
                  Halecium macrocephalum
                  Halecium marsupiale
                  Halecium minor
                  Halecium mirabile
                  Halecium mirandus
                  Halecium nullinodum
                  Halecium ochotense
                  Halecium paucinodum
                  Halecium pearsonenese
                  Halecium perexiguum
                  Halecium plicatocarpum
                  Halecium pygmaeum
                  Halecium pyriforme
                  Halecium ralpha
                  Halecium reduplicatum
                  Halecium regulare
                  Halecium repens
                  Halecium reversum
                  Halecium scalariformis
                  Halecium sibogae
                  Halecium spatulum
                  Halecium speciosum
                  Halecium telescopicum
                  Halecium tensum
                  Halecium tenue
                  Halecium tortum
                  Halecium vagans
                  Halecium vasiforme
                  Halecium wilsoni
                  Halecium singulare
                  Halecium flexile
                  Halecium beringi
                  Halecium washingtoni
                  Halecium simplex
                  Halecium parvulum
                  Halecium robustum
                  Halecium bithecum
                  Halecium tabulatum
                  Halecium banzare
                  Halecium brevithecum
                  Halecium elegantulum
                  Halecium macrocaulus
                  Halecium tubatum
                  Halecium arcticum
                  Halecium plumularioides
                  Halecium calderi
                  Halecium frigidum
                  Halecium minutum
                  Halecium tortile
                  Halecium planum
                  Halecium geniculatum
                  Halecium geniculatum
                  Halecium annuliforme
                Hydrodendron
                Ophiodissa
                Diplocyathus
                Baleum
                Hemitheca
                Nemalecium
                Saaba
                Diplocathus
                Sagamihydra
                Phylactotheca
                Georginella
                Hydrella
                Scoresbia
                Wimveria
                Sacculina
            Lafoeidae
            Laodiceidae
            Lovenellidae
            Phialellidae
            Plumulariidae
            Sertulariidae
            Aequoreidae
            Mitrocomidae
            Eirenidae
            Eucheilotidae
            Tiarannidae
            Barcinididae
            Blackfordiidae
            Dipleurosomatidae
            Halopterididae
            Kirchenpaueriidae
            Malagazziidae
            Melicertidae
            Orchistomidae
            Tiaropsidae
            Syntheciidae
            Hebellidae
            Teclaiidae
            Cirrholoveniidae
            Clathrozoidae
            Lineolariidae
            Octocannoididae
            Sugiuridae
          Proboscoida
        Laingiomedusae
        Anthomedusae
        Leptomedusae
        Gymnoblastea
        Athecata
        Thecata
        Siphonophora
      Trachylinae
      Hydroida
      Leptolinae
    Cnidaria incertae sedis
    Cubozoa
    Scyphozoa
    Staurozoa
  Sipuncula
  Echiura
  Pogonophora
  Entoprocta
  Tardigrada
  Phoronida
  Brachiopoda
  Echinodermata
  Hemichordata
  Chordata
  Gastrotricha
  Chaetognatha
  Ectoprocta
  Mesozoa
  Rotifera
  Gnathostomulida
  Acanthocephala
  Cycliophora
  Cephalorhyncha
  Placozoa
  Bryozoa
  Myxozoa
  Sipunculida
  Pentastomida
  Nemertini
Plantae
Fungi
Protozoa
Bacteria
Chromista
Archaea
Viruses
Monera