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Chapter 4

Chapter 4. Invertebrate Animal. Invertebrate animals are animals that do not have a backbone (or any bone tissue). Invertebrate Animal. Invertebrates live just about anywhere - frozen tundra - tropical rain forest - desert - water. Invertebrate Animal.

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Chapter 4

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  1. Chapter 4

  2. Invertebrate Animal Invertebrate animals are animals that do not have a backbone (or any bone tissue)

  3. Invertebrate Animal Invertebrates live just about anywhere - frozen tundra - tropical rain forest - desert - water

  4. Invertebrate Animal The fact that invertebrates do not have a backbone seems to limit their size Ocean dwelling invertebrates can be quite large

  5. Sponges • Poriferans – having many pores • Sessile – do not move • Made up of a collection of cells • Feed continuously on plankton and tiny organisms Reproduces: asexually – buds break off sexually – fertilized eggs become larva

  6. Cnidarians • Central body cavity • Have tentacles • Have nematocysts (stinging cells with a barbed filament) • Food enters and waste exits through same opening Reproduces: sexually – larvae asexually -buds

  7. Worms • 3 types of tube shaped organisms • Take in oxygen through their skin • Flatworms – simple body structures • Roundworms – have body systems; decomposers • Annelids – segmented, simple organ systems Reproduce sexually and asexually; have male and female parts

  8. Mollusks • Soft bodied • Many have shells • Have a muscular foot • Have a mantle (layer of folded skin for protection)

  9. Echinoderms • Spiny skinned • Exoskeleton • Have skeleton-like plates • Have tube feet Star fish Sea Urchin Shell Sand Dollar

  10. Arthropods • Jointed legs • Exoskeleton that molt • Generally has head, thorax, abdomen • Has open circulatory system (no blood vessels)

  11. Class: Insects • Have 3 pairs of legs • Reproduce sexually • Undergo metamorphosis (larva  pupa  adult) Video

  12. Class: Crustaceans • 3 pair of legs, 2 pair of sensory antennae • Open circulatory system • Reproduce sexually

  13. Class: Arachnids • Exoskeleton • 4 pair of legs, no antennae • 2 body segments

  14. Millipedes, Centipedes • Long segmented bodies • Millipedes have 2 pairs of legs per segment • Centipedes have 1 pair of legs per segment

  15. Body plans • Radial symmetry • organized around a central point • mouth-like opening leads to a gut • Bilateral symmetry • Identical left and right side • Mouth at front, waste opening at end

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