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Ch 19.3 Invertebrates

Ch 19.3 Invertebrates. Animal that does not have a backbone Make up 97% of animal species. Sponges. Simplest animals, two layers of cells Live in water, food from particles strained through pores in body wall. Cnidarians. All live in water

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Ch 19.3 Invertebrates

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  1. Ch 19.3 Invertebrates

  2. Animal that does not have a backbone • Make up 97% of animal species

  3. Sponges • Simplest animals, two layers of cells • Live in water, food from particles strained through pores in body wall

  4. Cnidarians • All live in water • Body parts arranged like spokes on a wheel = radial symmetry • Armlike tentacles used to capture prey by stinging them and push into body

  5. Flatworms • Flat and thin, right and left side of body are the same = bilateral symmetry • most are parasites, live on or inside other animals

  6. Roundworms • Long, round bodies come to a point at end • Bilateral symmetry • Live in soil or water, most are not parasitic • Some can be parasitic (hookworm)

  7. Segmented Worms • Body divided into segments • Live in soil, freshwater or ocean • Earthworms – food from soil, help plants • Leeches – feed from host

  8. Mollusks • Divided into 3 parts: head, body, foot • Snails/slugs • Hinged shells (clams) • Hunt other fish or animals

  9. Arthropods (4 types) • Largest group • Segmented animals with jointed legs, most have antennae • External skeleton to protect them • Molting – shed external skin

  10. Arthropods (cont.) • A. Crustaceans (crabs, crayfish) • 5 pairs of legs • Claws • B. Arachnids (spiders, ticks) • Four pairs of legs • Inject poison

  11. Arthropods (cont.) • C. Centipedes/Millipedes • 1 pair of legs/segment • Fast • Kill insects • D. Insects (mosquitoes, flies) • 3 pairs of legs • Most have wings • Go through metamorphosis • 2 pair of legs/segment • Slow • Eat dead plant matter

  12. Echinoderms (seastars,urchins) • Radial symmetry • Tube feet – used for movement

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