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Sponges. Simplest animal Lives in salt water Two layers of cells. Coral, sea flowers, and Jellyfish. Live in ocean Have tentacles with stinging cells Float to move – trap food Coral stays in one place. Flatworms. Flat bodies Parasites Tapeworms most common. Round worms. Many species
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Sponges Simplest animal Lives in salt water Two layers of cells
Coral, sea flowers, and Jellyfish • Live in ocean • Have tentacles with stinging cells • Float to move – trap food • Coral stays in one place
Flatworms • Flat bodies • Parasites • Tapeworms most common
Round worms • Many species • Parasites • Hook worms found in soil • Round worms found in dirty water
Segmented worms • Body is in segments – parts • Earth worms – tunnel through soil • Leeches – blood sucking – used in medicine
Spiny skinned • Starfish, sea urchins, sea cucumbers, sand dollars • Starfish most well known, have tubed feet • Starfish turn stomaches inside out to eat clams • Starfish are not fish
mollusks • Can live anywhere • Most have shells and soft bodies • Have muscular foot • Snails, clams, octopus, squid
Arthopods • Having joined legs –section bodies • Ectoskeleton • Largest group of invertebrates • Includes insects,, centipedes, millipedes arachnids , crustaceans
Insects • 6 legs • 3 body parts, head, abdomin, throax • Most have wings, some 2 sets • Pair of antenne on head
Arachnids • 8 legs • 2 body parts, head – body • Spiders, ticks, horseshoe crabs
Crustaceans • Considered an acrahnid • 8 legs, 2 body parts
Centipedes and millipedes • Centipedes have one pair of legs per segment they eat insects Millipedes have two pair of legs per section decomposers
