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