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Inverterbrates
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sponges
• Simplest invertebrate• Live in salt water• 2 layers of cells• Attach to one spot
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jellyfish
• Live in the ocean• Have tentacles with stinging cells• Float around trap their food
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flatworms
• Flat bodies• Parasites – tapeworm• Live inside host bodies
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Round worms
• Parasites – hookworm example• Found in soil and water
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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
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Spiny skinned animals
• Starfish, urchins, sand dollars• Starfish have tubed feet• Can break apart clams for food
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Mollusks
Octopus, squid, clam and snailsLive in both water and landMost have shells and soft bodies
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Arthropods
• Largest group of animals • Jointed feet with claws• Sectioned bodies• Exoskeletons
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insects
• Pair of antennae• 3 body parts, head, thorax, abdomen• Most have one or two pairs of wingsLive everywhere except the ocean
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Arachnids
• Spiders and horseshoe crabs• 8 legs • Two body parts – head and abdomen
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crustaceans
• Crabs, lobsters, barnacles, shrimp• Most live in the ocean or fresh water
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centipedes
• One pair of jointed legs per body section • Predators – eat insects
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millipedes
• Two pair of legs per body section• Often called 1000 legger• Decomposers