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

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  • Phylum: ARTHROPODA Honors Zoology - Nash
  • A R T H R O P O D A

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

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