Crayfish dissection

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Crayfish dissection

  1. 1. CRAYFISH DISSECTION
  2. 4. Animal Groups Image from: http://ology.amnh.org/biodiversity/treeoflife/pages/graph.html
  3. 5. ARTHROPODA <ul><li>“ Arthro” = jointed </li></ul><ul><li>“ pod” = foot </li></ul>
  4. 6. Arthropods
  5. 7. Structures to identify in lab <ul><li>All terns in the powerpoint that are printed in RED . </li></ul>
  6. 8. Classifying Crayfish <ul><li>Kingdom: ANIMALIA </li></ul><ul><li>Phylum: ARTHROPODA </li></ul><ul><li>Class: CRUSTACEA </li></ul>
  7. 9. <ul><li>EXOSKELETON- Outside body; NON-LIVING </li></ul><ul><li>Made of CHITIN (polysaccharide with some nitrogen) </li></ul>
  8. 10. All animals with an EXOSKELETON must MOLT (shed their exoskeleton) to grow bigger
  9. 11. SEGMENTED BODY like earthworms
  10. 12. <ul><li>Fusion of smaller segments to make one bigger section </li></ul>Head + thorax = cephalothorax
  11. 13. CARAPACE <ul><li>Part of exoskeleton that covers the cephalothorax </li></ul>
  12. 14. <ul><li>CHELIPED = Pincher (defense; capture food) </li></ul><ul><li>ROSTRUM = “visor” protects eyes </li></ul>
  13. 15. COMPOUND EYE HAS MULTIPLE LENSES
  14. 16. ANTENNAE - touch, taste ANTENNULES - touch, taste, & equilibrium
  15. 17. Statocyst
  16. 18. <ul><li>DECAPODS (10 legs) (4 pair walking legs + 2 chelipeds) </li></ul>
  17. 19. SWIMMERETS (5 pair)
  18. 20. SWIMMERETS Aid in reproduction In males – transfer sperm In females – carry eggs/young Create water currents
  19. 21. <ul><li>Telson </li></ul><ul><li>Uropods </li></ul>Telson Uropods Uropods
  20. 22. MAXILLA – Manipulate food
  21. 23. LAST PAIR of MAXILLA = “BAILERS” Keep water moving over gills
  22. 24. MANDIBLE
  23. 25. Appendages <ul><li>Walking legs </li></ul><ul><li>Cheliped </li></ul><ul><li>3. Maxillipeds </li></ul><ul><li>4. 2 nd maxilla (gill bailer) </li></ul><ul><li>5. 1 st maxilla </li></ul><ul><li>6. Mandible </li></ul><ul><li>7. Antenna </li></ul><ul><li>Antennule </li></ul>
  24. 26. APPENDAGES ANTENNA Touch, taste ANTENNULE Touch, taste, equilibrium MANDIBLE Chew food MAXILLA Manipulate food Last pair “bailers”- Move water over gills MAXILLIPEDS Touch, taste, manipulate food CHELIPED Capture food, defense WALKING LEGS Locomotion, move water over gills SWIMMERETS Move water over EGGS, transfer sperm (males) carry young/eggs (females) UROPOD Propulsion during tailflips
  25. 27. Is it a MALE OR FEMALE? <ul><li>MALES : first two pair of swimmerets form a channel to transfer sperm to female seminal receptacle </li></ul>
  26. 28. SWIMMERETS MALES Top pair make a “ V”
  27. 29. Females “ in berry ” carry developing embryos on swimmerets
  28. 30. REPRODUCTIVE <ul><li>SEPARATE SEXES </li></ul><ul><li>Male and Female </li></ul><ul><li>EXTERNAL FERTILIZATION </li></ul><ul><li>sperm & eggs join outside body </li></ul><ul><li>INDIRECT DEVELOPMENT </li></ul><ul><li>Starts as a larva </li></ul>
  29. 31. INDIRECT DEVELOPMENT MOLLUSKS ECHINODERMS CRUSTACEANS TROCHOPHORE BIPINNARIA NAUPLIUS
  30. 32. Examine the inside of your crayfish
  31. 33. <ul><li>GILLS (#2) </li></ul>RESPIRATORY Exchange gases Remove nitrogen waste (AMMONIA)
  32. 35. What keeps water moving over gills? “ BAILERS” WALKING LEGS: are attached to gills so walking moves water   Image from: http://www.aa.psu.edu/div/mns/biology/crayfish/crayfishtable.htm
  33. 36. INTERNAL Heart Stomach Digestive gland
  34. 37. OPEN CIRCULATORY SYSTEM <ul><li>HEART with openings (OSTIA) </li></ul><ul><li>ARTERIES leaving heart but NO VEINS to return hemolymph </li></ul>
  35. 38. OSTIA
  36. 39. ADDUCTOR MUSCLES run mouthparts
  37. 40. PYLORIC CARDIAC STOMACH
  38. 41. GASTRIC MILL “teeth” inside stomach
  39. 42. DIGESTIVE GLAND <ul><li>Makes bile; finishes digestion; absorbs nutrients </li></ul>
  40. 43. GONADS (produces sex cells)
  41. 44. <ul><li>Females: </li></ul><ul><li>OVARIES – make eggs SEMINAL RECEPTACLES - store received sperm </li></ul><ul><li>Males: </li></ul><ul><li>TESTES – make sperm </li></ul><ul><li>VAS DEFERENS- tubules inside that carry sperm from testes to exit opening </li></ul><ul><li>ENDOCRINE SYSTEM: controls sexual development </li></ul><ul><li>Also: molting, heart rate </li></ul>
  42. 45. ABDOMEN INTESTINE (#4) – finish digestion; absorb nutrients; collect & remove feces
  43. 46. <ul><li>GREEN GLANDS (#2) - collect and remove excess water & nitrogen waste (ammonia, NH 3 ) </li></ul>
  44. 47. NERVOUS SYSTEM like earthworms VENRAL NERVE CORD CEREBRAL GANGLIA (brain) GANGLIA along body
  45. 48. VENTRAL NERVE CORD
  46. 49. CEREBRAL GANGLIA = BRAIN <ul><li>Nerves connect </li></ul><ul><li>the eyes, antennae, </li></ul><ul><li>and antennules </li></ul><ul><li>to the brain.  </li></ul>
  47. 50. Brain Brain
  48. 51. AUTOTOMY & REGENERATION <ul><li>Crayfish have the ability to “self amputate” parts to escape predators and regenerate to repair injuries </li></ul>
  49. 52. THE END

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