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cnidarians invertebrates that have poison stingers on their tentacles; use them to capture prey
mollusks soft bodies; some live on land (snails/slugs) and some live in water (clams/oysters/squids); bilateral symmetry & many organ systems
echinoderms spiny skinned animals; star design & spiny skin (sand dollar/seastars/sea cucumbers/sea urchins)
endoskeleton internal structure with many protective spines; have tiny tube feet that grab things
arthropods largest of all invertebrate & animal phyla; live everywhere on Earth; have jointed legs & a body divided into sections; some have gills & others have open-tube breathing systems
exoskeleton hard skeleton on the outside of the body; protects & keeps arthropods from drying out; doesn't grow, but is shed by molting
chitin light, tough material that exoskeletons are made of
molting shedding of the exoskeleton
invertebrates animals without backbones
sponges shaped like a sack with an opening in the top; no symmetry, is hollow, & doesn't have bones; can grow back missing parts; has holes in it to filter food from water; adults don't move from place to place, but young sponges do
flatworms flat, ribbonlike bodies, with a head & tail; bilateral symmetry
planaria live in fresh water & eat food with a mouth
parasites live & feed inside the bodies of other animals; no mouth or digestive system; absorb food in their host's intestines
roundworms slender, rounded bodies with pointed ends; include ascaris, hookworms, and vinegar eels; have a one-way digestive system (food enters in one opening, but waste leaves through another)
segmented worms have bodies that are divided into sections; bilateral symmetry & digestive system with 2 openings (one for food to enter & one for waste to exit); earthworms
earthworms segmented worm with a head & tail; has bristles that help it move through the soil; complex organ systems (blood vessels, hearts, and nerves)
arachnids spiders, scorpions, ticks; 8 legs & up to 8 eyes; eat insects; spin webs to capture food
crustaceans crabs, lobsters, shrimp, barnacles, crayfish; antennae for sensing; 10 or fewer legs, including claws; sectioned body; use claws to fight & scare off predators
centipedes less than 100 legs; eat worms, slugs, insects
millipedes more than a 100 legs; eat plants; move slowly & legs move in a wavelike motion
insects beetles, flies, bees, ants, mosquitoes, butterflies, dragonflies; 1 pair of antennae; 6 legs, 2 wings, 3 body sections (head, thorax, legs); special tube for breathing & eyes made of hundreds of lenses; first insects lived about 350 million years ago
Created by: tjackat