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Phylum Arthopoda (Greek for “jointed foot”)

Phylum Arthopoda (Greek for “jointed foot”). Taylor Myers, Stephanie Gillespie, Tony Bent. Drill. Have you ever seen a: Spider Lobster Crab Insect Describe these animals and what makes them unique. . Vocabulary.

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Phylum Arthopoda (Greek for “jointed foot”)

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  1. Phylum Arthopoda(Greek for “jointed foot”) Taylor Myers, Stephanie Gillespie, Tony Bent

  2. Drill • Have you ever seen a: • Spider • Lobster • Crab • Insect Describe these animals and what makes them unique.

  3. Vocabulary • Appendage-Projecting part of an organism, with a distinct appearance or function. • Chitlin- A substance made of polysaccharides that forms the majority of an exoskeleton. • Spiracle- An external respiratory opening. • Exoskelton- A rigid external covering for the body.

  4. Characteristics • More than 83% of all animal species are arthropods. • All arthropods have exoskeletons made of chitlin. • Classified by habitat, body structure, diet. • Have an open circulatory system.

  5. Characteristics continued… • More evolved than their ancestors: • -Bilateral symmetry(left-right) • -Segmented body • -Hard exoskeleton • -Jointed legs • -Many pairs of legs • NO backbone

  6. Crustaceans • Two pairs of antennae • Branched appendages • Legs attached to abdomen • 30,000 species • Lobsters • Crayfish • Crabs • Barnacles • Shrimp Most members of this class are marine animals. Breathe through gills Shrimp, crayfish and lobster have specialized swimming structures

  7. Chelicerata • Ancient group-includes extinct animals. • Eight legs • Pinchers and fangs • No mandible (jawbone) • No antennae • Haemocoeliccavity(part of circulatory system) • Horseshoe crabs • Scorpions • Spiders • Mites

  8. Uniramians • One pair of antennae • Bilaterally symmetrical • Segmented and jointed legs • Tracheal system(series of tubes that carry oxygen to cells in an insect’s body) • Most live on land • Butterflies • Beetles • Millipedes/centipedes

  9. Evolution • Arrived on Earth during the Cambrian period. • Invaded new geographic areas and habitats over time as they evolved (new niches). • Still evolving after 500 million years. • Over 2 million types in the world.

  10. Evolution continued… • Theoretically evolved from annelids(segmented worms). • Related to the trilobites-died out 248 million years ago, almost extinct today. • Most successful animal Phylum on the planet (population, size, species diversity).

  11. Molting • A process in which animals shed their exoskeleton and inflate their body before the new skeleton hardens. • Occurs periodically. • The animal must shed (molt), and animals must then rapidly grow and produce a new, larger exoskeleton to grow into.

  12. Molting continued… • During molts, animals are extremely vulnerable. • Arthropods must molt to grow.

  13. Wrap-up • What have you learned about arthropods?

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