Metazoa

\n\n\n\n\n\n\n*Radiata\n***Cnidaria\n***Ctenophora - Comb jellies\n*Bilateria\n**Protostomia\n***Acoelomorpha\n***Platyhelminthes - Flatworms\n***Nemertina - Ribbon worms\n***Gastrotricha\n***Gnathostomulida - Jawed worms\n***Micrognathozoa\n***Rotifera - Rotifers\n***Acanthocephala\n***Priapulida\n***Kinorhyncha\n***Loricifera\n***Entoprocta\n***Nematoda - Roundworms\n***Nematomorpha - Horsehair worms\n***Cycliophora\n***Mollusca - Mollusks\n***Sipuncula - Peanut worms\n***Annelida - Segmented worms\n***Tardigrada - Water bears\n***Onychophora - Velvet worms\n***Arthropoda - Insects, etc.\n***Phoronida\n***Ectoprocta - Moss animals\n***Brachiopoda\n**Deuterostomia\n***Echinodermata\n***Chaetognatha - Arrow worms\n***Hemichordata - Acorn worms\n***Chordata - Vertebrates, etc.\n Metazoa is the Subkingdom in the tree of life that includes most of the multi-celled animals. More specifically, metazoa evolved differentiated cells including nerve cells and muscles. \n