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Exploring Invertebrates: A Dive into the World of Animals Without Backbones

Delve into the fascinating world of invertebrates - animals that make up 97% of all species. From sponges and cnidarians to flatworms and arthropods, discover the diversity and unique characteristics of these creatures. Learn about their habitats, feeding habits, and distinctive features in this educational journey.

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Exploring Invertebrates: A Dive into the World of Animals Without Backbones

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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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