After Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake, 1997 and Dong, Donoghue, Cheng & Liu, 2004

<==o Protostoma
   |?- Myzostomida (norkomadot)
   |?- Annelida [incl. Vestimentifera & Pogonophora sensu Rouse, 2001] (nivelmadot)
   |?- Mollusca (nilviäiset)
   |?- Sipuncula [Sipunculoidea] (ruiskumadot)
   |--o Lophotrochozoa
   |  |?- Mesozoa [see Basal Metazoa]
   |  |?- Entoprocta (pikarimadot)
   |  |?- BRYOZOA [Ectoprocta] (sammaleläimet)
   |  |?- Cycliophora Funch & Kristensen, 1995
   |  |?- Gastrotricha (sukaspintaiset)
   |  |?- Rotifera (rataseläimet)
   |  `?- Acanthocephala (väkäkärsämadot)
   `--o Ecdysozoa (nahanluojat)
      |?- Chaetognatha [incl. †Protoconodonta] (nuolimadot)
      |--o Introverta Nielsen, 1995 [=? Cycloneuralia]
      |  |--+-- Nemata [Nematoda] (nematodes; sukkulamadot)
      |  |  `-- Nematomorpha (jouhimadot)
      |  `--o Scelidophora
      |     |--+-- †Ancalagon
      |     |  `-- †Fieldia
      |     `--+--o †Markuelia Valīkov, 1983 [Middle and Late Cambrian protostome embryos]
      |        |  |-- †M. hunanensis Dong & Donoghue, in Dong, Donoghue, Cheng & Liu, 2004
      |        |  `-- †M. secunda Valīkov, 1983
      |        `--+-- Kinorhyncha [Kinorhynchida]
      |           `--+-- Loricifera
      |              `-- Priapulida [incl. Palaeoscolecida]
      `--o Euarthropoda [Arthropoda sensu lato]
         |-- Loboboda [Onychophora sensu lato] (käsnäjalkaiset; lobopods, velvet worms)
         |-- Tardigrada (karhukaiset; water bears)
         |-- Crustaceomorpha (äyriäistensukuiset niveljalkaiset)
         |-- Insecta [Hexapoda] (hyönteiset; insects)
         `--+-- Myriapoda
            `-- Chelicerata (kynsileukaiset)

Reference(s):