PARTII: COMPLEX ANIMALS CHAPTER 8. INVERTEBRATES 1.Phylum: Sponges 2.Phylum: Stinging cell 3.Phylum: Flatworm 4.Phylum: Roundworm 5.Phylum: Segmented.
Phylum= Chordata Evolved- 530 million years ago Ancestors are tunicates and lancelets.
