Click the links to browse through the WoRMS marine species taxonomy.
Animalia
  Mollusca
  Porifera
  Platyhelminthes
  Nematoda
  Annelida
  Nemertina
  Arthropoda
    Crustacea
    Chelicerata
      Arachnida
        Acarina
          Prostigmata
            Pontarachnidae
            Halacaroidea
              Halacaridae
                  Acarochelopodia
                  Actacarus
                  Anomalohalacarus
                  Copidognathides
                  Copidognathus
                  Agaue
                  Agauides
                  Agauopsis
                  Arhodeoporus
                  Atelopsalis
                  Bathyhalacarus
                  Bradyagaue
                  Camactognathus
                  Coloboceras
                  Colobocerasides
                  Halacarellus
                  Halacaropsis
                  Halacarus
                    Halacarus (Halacarellus)
                    Halacarus actenos
                    Halacarus aegyptus
                    Halacarus balgimus
                    Halacarus bisulcus
                    Halacarus borealis
                    Halacarus ctenopus
                    Halacarus griseus
                    Halacarus longiunguis
                    Halacarus prolongatus
                    Halacarus rismondoi
                    Halacarus spiniger
                    Halacarus subtilis
                    Halacarus leptopus
                    Halacarus longior
                    Halacarus arnaudi
                    Halacarus cucullatus
                    Halacarus excellens
                    Halacarus gracileunguiculatus
                    Halacarus hemispinosus
                    Halacarus minor
                    Halacarus nanus
                    Halacarus otiosus
                    Halacarus parmatus
                    Halacarus profundus
                    Halacarus propinquus
                    Halacarus robustus
                    Halacarus setifer
                    Halacarus validus
                    Halacarus werthi
                    Halacarus (Polymela)
                    Halacarus arenarius
                    Halacarus atlanticus
                    Halacarus celatus
                    Halacarus chilcottensis
                    Halacarus dictyotus
                    Halacarus discophorus
                    Halacarus echinatus
                    Halacarus elegans
                    Halacarus falklandensis
                    Halacarus flavellus
                    Halacarus frontiporus
                    Halacarus fuscatus
                    Halacarus helenae
                    Halacarus heraldensis
                    Halacarus higginsi
                    Halacarus juliani
                    Halacarus lamellipes
                    Halacarus magniporus
                    Halacarus malaysius
                    Halacarus membraneus
                    Halacarus microps
                    Halacarus mitrellus
                    Halacarus mollis
                    Halacarus mooreus
                    Halacarus multispinus
                    Halacarus newelli
                    Halacarus nitidus
                    Halacarus oblongus
                    Halacarus obtusus
                    Halacarus parvulus
                    Halacarus perditus
                    Halacarus peregrinus
                    Halacarus psammophilus
                    Halacarus rarus
                    Halacarus sabulonis
                    Halacarus socius
                    Halacarus spathulifer
                    Halacarus spongiphilus
                    Halacarus striatellus
                    Halacarus strigatus
                    Halacarus striolus
                    Halacarus tritoni
                    Halacarus triunguis
                    Halacarus turgidus
                    Halacarus zealandicus
                    Halacarus anomalus
                    Halacarus frontispinis
                    Halacarus lamellosus
                    Halacarus murrayi
                  Parhalixodes
                  Pelacarus
                  Thalassarachna
                  Werthella
                  Lohmannella
                  Scaptognathus
                  Isobactrus
                  Metarhombognathus
                  Rhombognathides
                  Rhombognathus
                  Acaromantis
                  Simognathus
                  Acanthohalacarus
                  Acanthopalpus
                  Mictognathus
                  Leptospathis
                  Acarothrix
                  Arenihalacarus
                  Astacopsiphagus
                  Australacarus
                  Corallihalacarus
                  Enterohalacarus
                  Halacaroides
                  Hamohalacarus
                  Himejacarus
                  Lobohalacarus
                  Parasoldanellonyx
                  Peregrinacarus
                  Phacacrus
                  Pontacarus
                  Porohalacarus
                  Porolohmannella
                  Pseudosoldanellonyx
                  Rhombognathopsis
                  Ropohalacarus
                  Scaptognathides
                  Soldanellonyx
                  Spongihalacarus
                  Stygohalacarus
                  Thalassacarus
                  Thallassopthirius
                  Tropihalacarus
                  Velardoacarus
                  Werthelloides
                  Winlundia
                  Xenohalacarus
                  Halixodes
                  Limnohalacarus
                  Makarovana
        Pseudoscorpiones
        Acari
      Pycnogonida
    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