A R T H R O P O D A
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A R T H R O P O D A

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A brief presentation concerning 3 major classes (subphlyla) within the phylum Arthropoda

A brief presentation concerning 3 major classes (subphlyla) within the phylum Arthropoda

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  • Phylum: ARTHROPODA Honors Zoology - Nash

A R T H R O P O D A A R T H R O P O D A Presentation Transcript

  • The ARTHROPODS
  • ARTHROPODA=>
    • segmented invertebrates
    • jointed appendages
    • have exoskeleton
    • most numerous AND diverse phylum
    • slow growth (must shed exoskeleton… called “molting”)
    • some have compound eyes (movement)
    • Simple eyes (ocelli)
  • 3 main classes
  • CRUSTACEA=>
    • 67,000 described species
    • Many consumed by humans – 10,000,000 tons
    • A few are hermaphrodites, but most have separate sexes
    • lobsters, shrimps, crabs, barnacles, pillbugs, daphnia, krill
    • Mostly marine, but a few freshwater and terrestrial
    • 2 body regions: cephalothorax & abdomen
  • CRUSTACEA=>
    • APPENDAGES: (sensing, chewing &holding, catching & defense, walking, swimming) Decapods
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  • Missouri’s crayfish species
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  • CRUSTACEA=>
    • GREEN GLAND – regulates salt & water levels in the blood
  • CRUSTACEA=>
    • GREEN GLAND – regulates salt & water levels in the blood
    • barnacles - sessile crustaceans
  • hermit crab
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  • Caribbean Spiny Lobster
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  • Mammalian intellect?
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  • “ cleaner” shrimp
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  • isopod on soldierfish
  • ARACHNIDA=>
    • Phylum: Arthropoda,
    • Class: Arachnida
    • spiders, scorpions, mites, ticks, horseshoe crabs
    • 8 legs, 4 mouthparts (2 pedipalps to hold & chew + 2 fangs (chelicera)
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  • ARACHNIDA=>
    • Phylum: Arthropoda,
    • Class: Arachnida
    • “ book lungs” – modified gills made of folds of tissue that hang below (surface area)
    • “ malpighian tubules” – excretory organs that filter wastes
      • water conservation!
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  • ARACHNIDA=>
    • TICKS & MITES – most all are parasites
      • impt. in transmission of disease
      • Lyme Disease, Rocky Mountain Spotted Fever
      • mites are smaller (dust mites)
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  • ARACHNIDA=>
    • SCORPIONS – long, segmented abdomen w/stinger at end
      • 2,000 species
      • pedipalps are modified into claws
      • few are truly dangerous to humans
  • ARACHNIDA=>
    • 2 Main body Regions
    • Cephalothorax and abdomen
    • Only truly dangerous scorpion in US is Arizona Bark Scorpion
    • … but this really seems a bit much.
  • ARACHNIDA=>
    • SPIDERS –
      • “ hunting” spiders have thick, hairy legs and good eyes
      • “ web building” spiders have long, thin legs and poor eyesight
  • ARACHNIDA=>
    • SPIDERS –
      • tend to have 8 simple eyes
      • “ web building” spiders have long, thin legs and poor eyesight
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  • ARACHNIDA=>
    • HORSESHOE CRABS – are not crabs
      • ancient, gill-bearing arthropods
      • no malpighian tubules… why would they need them?
  • INSECTA=>
    • Phylum: Arthropoda
    • Class: Insecta
    • 75% of all known animal species
    • 1 st to develop flight
    • 1 st to truly use “communication”
      • 3 types:
      • SONIC, VISUAL & CHEMICAL
  • INSECTA=>
    • 3 distinct body regions:
      • HEAD, THORAX & ABDOMEN
    • one pair of antennae
    • one pair of cmpd. eyes (up to 3 simple)
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  • INSECTA=>
    • three pair of mouthparts
    • most have one or two pairs of wings
      • modified exoskeleton
  • INSECTA=>
    • RESPIRATION:
      • Trachea - tubes connected to spiracles
      • Spiracles are observable openings on exoskeleton
  • INSECTA=>
    • RESPONSE:
      • best sensory systems of all arthropods
      • some have receptors on bottom of feet (taste)
      • compound eyes
      • sensitive antennae
  • INSECTA=>
    • DIGESTION & EXCRETION:
      • after gizzard is a midgut and hindgut before the anus
      • Excretion - malpighian tubules
  • INSECTA=>
    • METAMORPHOSIS:
      • a series of changes in which young insects change into adults
      • Complete metamorphosis
      • Incomplete metamorphosis
  • INSECTA=>
      • Complete metamorphosis
  • INSECTA=>
      • Incomplete metamorphosis
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    • Something new you learned
    • Something you still have questions about
    • Information you still Need
    • Something we haven’t covered that you would like to learn about (arthropods)