- Acoelomorpha
- Annelida
- Arthropoda
- Cheliceriformes
- Crustacea
- Hexapoda
- Myriapoda
- Brachiopoda
- Bryozoa (Ectoprocta)
- Chaetognatha
- Cycliophora
- Entoprocta
- Gastrotricha
- Gnathostomulida
- Kinorhyncha
- Loricifera
- Micrognathozoa
- Mollusca
- Nematoda
- Nematomorpha
- Nemertea
- Onychophora
- Orthonectozoa
- Pentastoma
- Phoronida
- Platyhelminthes
- Priapulida
- Rhombozoa
- Rotifera (Syndermata)
- Sipuncula
- Tardigrada