Arthropoda

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Arthropoda

  1. 1. Arthropoda
  2. 2. Core Concept <ul><li>Exoskeleton= chitin </li></ul><ul><li>Jointed appendage </li></ul><ul><li>Segmented body </li></ul><ul><li>brain- dorsal part of the head </li></ul><ul><li>Ventral nerve cord </li></ul><ul><li>Open circuatory system, single heart </li></ul>
  3. 3. <ul><li>Body plan- adaptation for low water loss </li></ul><ul><li>Found in all types of habitat </li></ul>
  4. 4. <ul><li>Four major subphyla </li></ul><ul><ul><li>Trilobita (fossilized trilobites) </li></ul></ul><ul><ul><li>Chelicerata (spiders, ticks, mites, scorpions, horseshoe crabs) </li></ul></ul><ul><ul><li>Crustacea (crabs, craysfish, shrimps, barnacles, pill bugs, water fleas) </li></ul></ul><ul><ul><li>Uniramia (centipedes, millipedes,, all insects) </li></ul></ul><ul><ul><ul><li>Class Chilopoda (centipede) </li></ul></ul></ul><ul><ul><ul><li>Class Diplopoda (millipedes) </li></ul></ul></ul><ul><ul><ul><li>Insecta </li></ul></ul></ul>
  5. 5. Keywords <ul><li>Arthropoda Trilobita Chelicerata </li></ul><ul><li>Crustacea Uniramia Chilopoda </li></ul><ul><li>Diplopoda Insecta Molting </li></ul><ul><li>Metamorphosis:complete/incomplete </li></ul><ul><li>Hemolymph hemocoel ventral nerve cord </li></ul><ul><li>Head thorax abdomen cephalotorax </li></ul><ul><li>Carapace chelicerae malpighian tubules </li></ul><ul><li>Green gland book gills book lungs </li></ul><ul><li>Spiracles tracheal tubes </li></ul>
  6. 6. Characteristics <ul><li>2 out of 3 organisms are arthropods </li></ul><ul><li>Segments: head, thorax, abdomen </li></ul><ul><li>Fused segments: cephalotorax </li></ul><ul><li>Extensive cephalization </li></ul><ul><li>Open circulatory system: use of hemolymph and hemocoels </li></ul><ul><li>Exoskeleton: prevents water loss, attachment of muscle </li></ul>
  7. 7. <ul><li>Exoskeleton- limits growth </li></ul><ul><ul><li>Molting- allows growth (energy expensive) </li></ul></ul><ul><ul><li>Bases for subdivision of phylum- number of antenna, presence or absence of jawlike mandibles, type of appendages </li></ul></ul><ul><ul><li>*Crustaceans and insects may be more closely related </li></ul></ul>
  8. 8. Digestive system <ul><li>Complete gut </li></ul><ul><li>Every mode of feeding </li></ul>
  9. 9. Respiratory system <ul><li>Gills- aquatic </li></ul><ul><li>Book gills- horseshoe crab </li></ul><ul><li>Book lungs </li></ul><ul><li>Tracheal tubes w/ spiracles </li></ul>
  10. 10. Circulatory System <ul><li>Well-developed heart </li></ul><ul><li>Open circulatory system </li></ul><ul><li>Hemolymph –blood + interstitial fluid </li></ul><ul><li>Sinus- space that surrounds organs </li></ul><ul><li>Hemocoel collective term </li></ul>
  11. 11. Excretory system <ul><li>Malpighian tubule- remove nitrogenous waste from blood </li></ul><ul><li>Gills </li></ul><ul><li>Green glands- found beneath the antenna, remove nitrogenous waste </li></ul>
  12. 12. Nervous system <ul><li>Brain- made up of pair of ganglia </li></ul><ul><li>Ventral nerve cord- presence of ganglia per segment </li></ul><ul><li>Simple and complex sense organs </li></ul><ul><ul><li>Statocysts- balance </li></ul></ul><ul><ul><li>Compound eye- ommatidium of fly </li></ul></ul>
  13. 13. Reproductive system <ul><li>Internal fertilization </li></ul><ul><li>Some have queens </li></ul>
  14. 14. Subphylum Trilobita <ul><li>Oldest subphylum </li></ul><ul><li>Extinct </li></ul><ul><li>Three lengthwise lobes from head to tail </li></ul><ul><li>One pair of unspecialized appendages per body segment </li></ul><ul><li>Appendage divided into two branches </li></ul><ul><ul><li>Gill </li></ul></ul><ul><ul><li>Walking leg </li></ul></ul>
  15. 15. Subphylum Chelicerata <ul><li>Cheilos- lips; cheir- arm </li></ul><ul><li>Chelicerae- clawlike feeding appendage </li></ul><ul><li>Arachnids- chelicerae are called pedipalps </li></ul><ul><li>4 pairs of walking legs </li></ul><ul><li>2 fused segments- cephalothorax, abdomen </li></ul><ul><li>Lack antenna </li></ul>
  16. 16. Subphylum Crustacea <ul><li>Mostly aquatic and marine </li></ul><ul><li>2 pairs of antenna </li></ul><ul><li>Mouth parts are called mandibles </li></ul><ul><li>2 branches of appendages </li></ul><ul><li>Many have carapace </li></ul>
  17. 17. Subphylum Uniramia <ul><li>Almost all are terrestrial </li></ul><ul><li>1 pair of antenna </li></ul><ul><li>Have mandibles </li></ul><ul><li>Unbranched appendages </li></ul>
  18. 18. Class Chilopoda <ul><li>Centipedes </li></ul><ul><li>Long, worm-like body </li></ul><ul><li>Many segments </li></ul><ul><li>One pair/ segment </li></ul><ul><li>Poison claw for feeding </li></ul><ul><li>carnivorous </li></ul>
  19. 19. Class Diplopoda <ul><li>Wormlike bodies with many segments </li></ul><ul><li>2 pairs of legs per segment </li></ul><ul><li>Mostly herbivorous </li></ul>
  20. 20. Class Insecta <ul><li>Insects </li></ul><ul><li>Body parts- head, thorax, abdomen </li></ul><ul><li>Three pairs of legs </li></ul><ul><li>Usually two pairs of wings attach to thorax </li></ul><ul><li>Metamorphosis: complete/incomplete </li></ul>

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