1. Inverterbrates

2. sponges Simplest invertebrate Live in salt water 2 layers of cells Attach to one spot

3. jellyfish Live in the ocean Have tentacles with stinging cells Float around trap their food

4. flatworms Flat bodies Parasites – tapeworm Live inside host bodies

5. Round worms Parasites – hookworm example Found in soil and water

6. Segmented worms Have segments in their bodies Earthworm example They burrow through soil bring air to plants Leeches another example – blood sucking – Used in medicine

7. Spiny skinned animals Starfish, urchins, sand dollars Starfish have tubed feet Can break apart clams for food

8. Mollusks Octopus, squid, clam and snails Live in both water and land Most have shells and soft bodies

9. Arthropods Largest group of animals Jointed feet with claws Sectioned bodies Exoskeletons

10. insects Pair of antennae 3 body parts, head, thorax, abdomen Most have one or two pairs of wings Live everywhere except the ocean

11. Arachnids Spiders and horseshoe crabs 8 legs Two body parts – head and abdomen

12. crustaceans Crabs, lobsters, barnacles, shrimp Most live in the ocean or fresh water

13. centipedes One pair of jointed legs per body section Predators – eat insects

14. millipedes Two pair of legs per body section Often called 1000 legger Decomposers