Metazoa

Radiata

- Cnidaria
- Ctenophora - Comb jellies
Bilateria
- Protostomia
  - Acoelomorpha
  - Platyhelminthes - Flatworms
  - Nemertina - Ribbon worms
  - Gastrotricha
  - Gnathostomulida - Jawed worms
  - Micrognathozoa
  - Rotifera - Rotifers
  - Acanthocephala
  - Priapulida
  - Kinorhyncha
  - Loricifera
  - Entoprocta
  - Nematoda - Roundworms
  - Nematomorpha - Horsehair worms
  - Cycliophora
  - Mollusca - Mollusks
  - Sipuncula - Peanut worms
  - Annelida - Segmented worms
  - Tardigrada - Water bears
  - Onychophora - Velvet worms
  - Arthropoda - Insects, etc.
  - Phoronida
  - Ectoprocta - Moss animals
  - Brachiopoda
- Deuterostomia
  - Echinodermata
  - Chaetognatha - Arrow worms
  - Hemichordata - Acorn worms
  - Chordata - Vertebrates, etc.

</table> Metazoa usually refers to the animals with fully differentiated tissues, including nerves and muscles. This includes all the animal phyla except the sponges, Trichoplax, and certain parasites. In older texts, Metazoa is often taken to be synonymous with our Animalia, excluding only the protozoa. It may be formalized as a subkingdom, but its treatment varies considerably.

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