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An Introduction to Invertebrates Chapter 33 Porifera (Sponges) Parazoa (no true tissue) Sedentary (Sessile) Suspension Feeders Choanocytes (Collar Cells) Cnidarians (Hydras, Corals, Jellies) Eumetazoans (True Tissue) Diploblastic Radial Body Plan Gastrovascular cavity Single opening serves as anus and mouth Lophotrochozoans Eumetazoans Bilateral Symmetry Triploblastic Lophotrochozoans Platyhelminthes (Flatworms) Triploblastic acoelomates Ex. Planarians Platyhelminthes (Flatworms) Trematodes (parasitic flukes) Platyhelminthes (Flatworms) Tapeworms (parasitic flatworm) Scolex proglottids Lophotrochozoans Rotifers Alimentary canal Pseudocoelomates parthenogenesis Lophotrochozoans Lophophorates Have crown of ciliated tentacles around mouth Coelomates