Sponges Cnidarians acoel flatworms Deuterostomes Protostomes the clade of Bilaterian animals excluding the acoels was recently named Nephrozoa – “animals.
Phylum Nemertea & Chaetognatha 1 Phylum Nemertea & Phylum Chaetognatha Ribbon Worms Arrow Worms.
Phylum Platyhelmenthes (the flatworms) General characteristics
