Phylum Arthopoda (Greek for “jointed foot”)
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Transcript of Phylum Arthopoda (Greek for “jointed foot”)
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Phylum Arthopoda(Greek for “jointed foot”)
Taylor Myers, Stephanie Gillespie, Tony Bent
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Drill Have you ever seen a:
› Spider› Lobster› Crab› InsectDescribe these animals and what makes them unique.
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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.
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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.
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Characteristics continued…
More evolved than their ancestors: -Bilateral symmetry(left-right) -Segmented body -Hard exoskeleton -Jointed legs -Many pairs of legs NO backbone
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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
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Chelicerata Ancient group-includes extinct animals. Eight legs Pinchers and fangs No mandible (jawbone) No antennae Haemocoelic cavity(part of circulatory system)
› Horseshoe crabs› Scorpions› Spiders› Mites
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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
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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.
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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).
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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.
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Molting continued… During molts, animals are extremely
vulnerable. Arthropods must molt to grow.
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Wrap-up What have you learned about
arthropods?