Biota [unranked]
  Animalia [kingdom]
    Acanthocephala Rudolphi, 1802 [phylum]
    Annelida [phylum]
      Clitellata [class]
        Acanthobdellida [order]
          Acanthobdellidae [family]
        Arhynchobdellida [order]
          Cylicobdellidae [family]
          Erpobdellidae [family]
          Haemadipsidae [family]
          Haemopidae [family]
          Hirudinidae [family]
        Branchiobdellida [order]
        Euhirudinea [order]
          Salifidae [family]
        Oligochaeta [subclass]
        Opisthopora [order]
        Rhynchobdellida [order]
          Glossiphoniidae [family]
          Ozobranchidae [family]
          Piscicolidae [family]
      Polychaeta [class]
    Arthropoda [phylum]
      Arachnida [subclass]
        Acariformes [superorder]
          Sarcoptiformes [order]
            Astigmata [suborder]
              Acaroidea [superfamily]
                Acaridae [family]
                Gaudiellidae [family]
                Glycacaridae [family]
                Lardoglyphidae [family]
                Scatoglyphidae [family]
                Suidasiidae [family]
              Analgoidea [superfamily]
                Alloptidae [family]
                Analgidae [family]
                Apionacaridae [family]
                Avenzoariidae [family]
                Cytoditidae [family]
                Dermationidae [family]
                Dermoglyphidae [family]
                Epidermoptidae [family]
                Gaudoglyphidae [family]
                Laminosioptidae [family]
                Proctophyllodidae [family]
                Psoroptoididae [family]
                Pteronyssidae [family]
                Ptyssalgidae [family]
                Pyroglyphidae [family]
                Thysanocercidae [family]
                Trouessartiidae [family]
                Turbinoptidae [family]
                Xolalgidae [family]
              Canestrinioidea Berlese, 1884 [superfamily]
              Chetochelacaridae [family]
              Glycyphagoidea [superfamily]
                Aeroglyphidae [family]
                Chortoglyphidae [family]
                Echimyopodidae [family]
                Euglycyphagidae [family]
                Glycyphagidae [family]
                Pedetopodidae [family]
                Rosensteiniidae [family]
              Hemisarcoptoidea Oudemans, 1908 [superfamily]
              Heterocoptidae [family]
              Histiostomatoidea Berlese, 1897 [superfamily]
              Hypoderatoidea [superfamily]
                Hypoderatidae [family]
              Lemanniellidae [family]
              Pterolichoidea [superfamily]
                Ascouracaridae [family]
                Caudiferidae [family]
                Cheylabididae [family]
                Crypturoptidae [family]
                Eustathiidae [family]
                Falculiferidae [family]
                Freyanidae [family]
                Gabuciniidae [family]
                Kiwilichidae [family]
                Kramerellidae [family]
                Ochrolichidae [family]
                Oconnoriidae [family]
                Pterolichidae [family]
                Ptiloxenidae [family]
                Rectijanuidae [family]
                Syringobiidae [family]
                Thoracosathesidae [family]
                Vexillariidae [family]
              Sarcoptoidea [superfamily]
                Atopomelidae [family]
                Chirodiscidae [family]
                Chirorhynchobiidae [family]
                Gastronyssidae [family]
                Lemurnyssidae [family]
                Listrophoridae [family]
                Listropsoralgidae Fain, 1965 [family]
                Lobalgidae [family]
                Myocoptidae [family]
                Pneumocoptidae [family]
                Psoroptidae [family]
                Rhyncoptidae [family]
                Sarcoptidae [family]
              Schizoglyphoidea Mahunka, 1978 [superfamily]
            Endeostigmata Reuter, 1909 [suborder]
            Oribatida Dug�s, 1834 [suborder]