Phylum Porifera (sponges)
Phylum Cnidaria (have tentacles with stinging cells, e.g. corals, jellyfish, sea anemone)
Phylum Platyhelminthes (Flatworms, lacking respiratory/circulatory systems, oxygen passes through by diffusion, e.g. liver fluke, planaria)
Phylum Nematoda (Roundworms, e.g. ascaris)
Phylum Annelida (Segmented Worms, e.g. earthworm, leech)
Phylum Mollusca (Invertebrates with soft unsegmented bodies, e.g. snail, squid, clam)
Phylum Echinodermata (e.g. starfish, sea urchin)
Phylum Arthropoda (jointed legs, biggest group of invertebrates, have exoskeleton and segmented bodies, e.g. insects, arachnids, crustaceans, millipedes, centipedes)