1. The Invertebrates Chapter 12A Introduction to the Animal Kingdom

2. Zoology The study of animals

3. Animals Eukaryotic and multicellular Eukaryotic and multicellular Have organized tissues Have organized tissues Consumers Consumers About 95% are invertebrates About 95% are invertebrates

4. Invertebrate An animal without a backbone

5. Invertebrates Have skeletons Have skeletons – May be internal or external Much variety Much variety

6. The Invertebrates Chapter 12B Sponges and Cnidarians

7. Phylum Porifera The pore-bearing animals

8. Sponges Porifera = “pore bearer” Porifera = “pore bearer” Live in water Live in water Sessile Sessile Can reproduce sexually or asexually Can reproduce sexually or asexually

10. Sponges Skeleton Skeleton – Spongin – Spicules Collar cells Collar cells Filter feeders Filter feeders

11. Phylum Cnidaria The stinging animals

12. Cnidaria Live in water Live in water Radial symmetry Radial symmetry – Umbrella-shaped Medusa Medusa – Tubular Polyp Polyp

13. Radial Symmetry (Hydra)

14. Cnidaria Free-swimming or sessile Free-swimming or sessile Can reproduce sexually or asexually Can reproduce sexually or asexually

17. Jellyfish Hydrostatic skeleton Hydrostatic skeleton Gastrovascular cavity Gastrovascular cavity – Only body opening is its mouth Nerves, but no brain Nerves, but no brain

18. Jellyfish Nematocysts Nematocysts – For food – For defense Swimming Swimming

19. Phylum Cnidaria Other Examples

20. Hydra

22. Portuguese Man of War

23. Coral