Click the links to browse through the WoRMS marine species taxonomy.
Animalia
  Mollusca
  Porifera
  Platyhelminthes
  Nematoda
  Annelida
  Nemertina
  Arthropoda
    Crustacea
      Remipedia
      Branchiopoda
      Maxillopoda
        Mystacocarida
        Copepoda
          Progymnoplea
          Neocopepoda
            Gymnoplea
            Podoplea
              Cyclopoida
              Harpacticoida
                Adenopleurellidae
                Aegisthidae
                Ambunguipedidae
                Ameiridae
                Ancorabolidae
                Arenopontiidae
                Argestidae
                Balaenophilidae
                Canthocamptidae
                Canuellidae
                Cerviniidae
                Cletodidae
                Cletopsyllidae
                Clytemnestridae
                Cristacoxidae
                Cylindropsyllidae
                Danielsseniidae
                Darcythompsoniidae
                Diosaccidae
                Ectinosomatidae
                Euterpinidae
                Harpacticidae
                Huntemanniidae
                Laophontidae
                Laophontopsidae
                Latiremidae
                Leptastacidae
                Leptopontiidae
                Longipediidae
                Louriniidae
                Metidae
                Miraciidae
                  Amphiascopsis
                  Schizoperopsis
                  Teissierella
                  Miscegenus
                  Microthalestris
                  Mesamphiascus
                  Diosaccinae
                    Amonardia
                    Amphiascoides
                    Amphiascus
                    Bulbamphiascus
                    Dactylopodamphiascopsis
                    Diosaccopsis
                    Diosaccus
                    Eoschizopera
                    Haloschizopera
                    Ialysus
                    Metamphiascopsis
                    Paramphiascella
                    Paramphiascopsis
                    Pararobertsonia
                    Protopsammotopa
                    Psammotopa
                    Pseudamphiascopsis
                    Pseudodiosaccopsis
                    Pseudodiosaccus
                    Rhyncholagena
                    Robertgurneya
                    Robertsonia
                    Schizopera
                      Schizopera (Neoschizopera)
                      Schizopera (Schizopera)
                      Schizopera elatensis
                      Schizopera aegyptica
                      Schizopera anomala
                      Schizopera aralensis
                      Schizopera arconae
                      Schizopera baltica
                      Schizopera californica
                      Schizopera carolinensis
                      Schizopera chiloensis
                      Schizopera cicolanii
                      Schizopera consimilis
                      Schizopera crassispinata
                      Schizopera dimentmani
                      Schizopera fimbriata
                      Schizopera giselae
                      Schizopera gligici
                      Schizopera haitiana
                      Schizopera inopinata
                      Schizopera inornata
                      Schizopera issykkulica
                      Schizopera knabeni
                      Schizopera kunzi
                      Schizopera lacusamari
                      Schizopera lagrecai
                      Schizopera lindae
                      Schizopera longicauda
                          Schizopera longicauda clandestina
                      Schizopera marlieri
                      Schizopera minuticornis
                      Schizopera monardi
                      Schizopera neglecta
                      Schizopera noodti
                      Schizopera ornata
                      Schizopera parvula
                      Schizopera petkovskii
                      Schizopera pori
                      Schizopera pratensis
                      Schizopera pseudojugurtha
                      Schizopera reducta
                      Schizopera rotundipes
                      Schizopera sclaris
                      Schizopera soyeri
                      Schizopera spinifer
                      Schizopera spinulosa
                      Schizopera stephanidesi
                      Schizopera syltensis
                      Schizopera taricheana
                      Schizopera tobae
                      Schizopera triacantha
                      Schizopera ungulata
                      Schizopera validior
                      Schizopera variseta
                      Schizopera varnensis
                      Schizopera vicina
                      Schizopera longirostris
                      Schizopera clandestina
                      Schizopera akatovae
                      Schizopera arenicola
                      Schizopera bozici
                      Schizopera bradyi
                      Schizopera bursinae
                      Schizopera chaetosa
                      Schizopera compacta
                      Schizopera gauldi
                      Schizopera grimalschii
                      Schizopera indica
                      Schizopera jugurtha
                      Schizopera langi
                      Schizopera longifurcata
                      Schizopera meridionalis
                      Schizopera minuta
                      Schizopera nana
                      Schizopera nichollsi
                      Schizopera paradoxa
                      Schizopera pontica
                      Schizopera subterranea
                      Schizopera osana
                      Schizopera hawaiiensis
                      Schizopera nicoyana
                      Schizopera major
                      Schizopera propinqua
                      Schizopera ciliata
                      Schizopera pusilla
                      Schizopera uramurdahi
                      Schizopera oldcuei
                      Schizopera jundeei
                      Schizopera depotspringsi
                      Schizopera costaricana
                      Schizopera austindownsi
                      Schizopera rybnikovi
                      Schizopera roberiverensis
                      Schizopera weelumurra
                      Schizopera setulosa
                      Schizopera spinulosa
                    Typhlamphiascus
                    Antiboreodiosaccus
                    Parialysus
                    Pholenota
                    Actopsyllus
                    Schizoperoides
                    Balucopsylla
                    Helmutkunzia
                    Paramphiascoides
                    Goffinella
                    Neomiscegenus
                    Tydemanella
                  Amphiascella
                  Beatricella
                  Dactylamphiascopsis
                  Dwightia
                  Paradiosaccus
                  Protoleptastacus
                  Setella
                  Spio
                  Teisseriella
                  Varnaia
                  Sarsamphiascus
                  Monardius
                  Miraciinae
                  Stenheliinae
                Neobradyidae
                Normanellidae
                Novocriniidae
                Orthopsyllidae
                Paramesochridae
                Parastenheliidae
                Parastenocarididae
                Peltidiidae
                Phyllognathopodidae
                Porcellidiidae
                Psammopsyllidae
                Rhizothricidae
                Rotundiclipeidae
                Superornatiremidae
                Tachidiidae
                Tegastidae
                Tetragonicepsidae
                Thalestridae
                Thompsonulidae
                Tisbidae
                Zosimeidae
                Paranannopidae
                Ectinosomidae
                Pseudopeltidiidae
                Pteropsyllidae
                Rhynchothalestridae
                Pseudotachidiidae
                Idyanthidae
                Dactylopusiidae
                Ismardiidae
                Metahuntemanniidae
                Heteropsyllidae
                Parameiropsidae
                Nannopodidae
                Idyaeidae
              Poecilostomatoida
              Siphonostomatoida
              Monstrilloida
              Misophrioida
              Mormonilloida
          Thaumatopsylloida
        Branchiura
        Tantulocarida
        Thecostraca
        Pentastomida
      Malacostraca
      Ostracoda
      Pentastomata
    Chelicerata
    Myriapoda
    Hexapoda
  Ctenophora
  Cnidaria
  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