Inverterbrates

sponges

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

jellyfish

• Live in the ocean• Have tentacles with stinging cells• Float around trap their food

flatworms

• Flat bodies• Parasites – tapeworm• Live inside host bodies

Round worms

• Parasites – hookworm example• Found in soil and water

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

Spiny skinned animals

• Starfish, urchins, sand dollars• Starfish have tubed feet• Can break apart clams for food

Mollusks

Octopus, squid, clam and snailsLive in both water and landMost have shells and soft bodies

Arthropods

• Largest group of animals • Jointed feet with claws• Sectioned bodies• Exoskeletons

insects

• Pair of antennae• 3 body parts, head, thorax, abdomen• Most have one or two pairs of wingsLive everywhere except the ocean

Arachnids

• Spiders and horseshoe crabs• 8 legs • Two body parts – head and abdomen

crustaceans

• Crabs, lobsters, barnacles, shrimp• Most live in the ocean or fresh water

centipedes

• One pair of jointed legs per body section • Predators – eat insects

millipedes

• Two pair of legs per body section• Often called 1000 legger• Decomposers