CRAYFISHDISSECTION
Animal GroupsImage from: http://ology.amnh.org/biodiversity/treeoflife/pages/graph.html
ARTHROPODA  “Arthro” = jointed  “pod” = foot
Arthropods
Structures to identify in lab• All terns in the powerpoint that are printed  in RED.
Classifying CrayfishKingdom:   ANIMALIAPhylum:    ARTHROPODAClass:     CRUSTACEA
EXOSKELETON- Outside body; NON-LIVINGMade of CHITIN (polysaccharide with some nitrogen)
All animals with an EXOSKELETONmust MOLT (shed their exoskeleton)            to grow bigger
SEGMENTED BODY  like earthworms
Fusion of smaller segments to make one bigger section Head + thorax = cephalothorax
CARAPACEPart of exoskeleton that covers the cephalothorax
CHELIPED = Pincher (defense; capture food)ROSTRUM = “visor” protects eyes
COMPOUND EYEHAS MULTIPLE LENSES
ANTENNAE- touch, tasteANTENNULES- touch,taste, & equilibrium
Statocyst
DECAPODS (10 legs)(4 pair walking legs + 2 chelipeds)
SWIMMERETS (5 pair)
SWIMMERETSAid in reproductionIn males – transfer spermIn females – carry eggs/young     Create water currents
TelsonUropods          Uropods            Uropods                    Telson
MAXILLA – Manipulate food
LAST PAIR of MAXILLA = “BAILERS”Keep water moving over gills
MANDIBLE
Appendages1.   Walking legs2.   Cheliped3.   Maxillipeds4.    2nd maxilla       (gill bailer)5.   1st maxilla6.   Mandible...
APPENDAGESANTENNA           Touch, tasteANTENNULE         Touch, taste, equilibriumMANDIBLE          Chew foodMAXILLA     ...
Is it a MALE OR FEMALE?MALES:first two pairof swimmeretsform a channelto transfersperm to femaleseminal receptacle
SWIMMERETS        MALES        Top pair        make a        “V”
Females “in berry”carry developing embryos on swimmerets
REPRODUCTIVESEPARATE SEXES   Male and FemaleEXTERNAL FERTILIZATION   sperm & eggs join outside bodyINDIRECT DEVELOPMENT  S...
INDIRECT DEVELOPMENTMOLLUSKS   ECHINODERMS     CRUSTACEANSTROCHOPHORE   BIPINNARIA   NAUPLIUS
Examine the inside of your crayfish
RESPIRATORYGILLS (#2)   Exchange gases             Remove nitrogen waste (AMMONIA)
What keeps water moving over gills?“BAILERS”WALKING LEGS:are attached to gills so walking moveswater   Image from:   http:...
INTERNAL               Heart Stomach   Digestive gland
OPEN CIRCULATORY SYSTEMHEART with openings (OSTIA)ARTERIES leaving heart but NO VEINS to return hemolymph
OSTIA
ADDUCTOR MUSCLES   run mouthparts
STOMACHPYLORIC     CARDIAC
GASTRIC MILL“teeth” inside stomach
DIGESTIVE GLANDMakes bile; finishes digestion; absorbs nutrients
GONADS (produces sex cells)
Females:  OVARIES – make eggs  SEMINAL RECEPTACLES - store received spermMales:  TESTES – make sperm  VAS DEFERENS- tubule...
ABDOMENINTESTINE (#4) – finish digestion; absorb    nutrients; collect & remove feces
GREEN GLANDS (#2) - collect and remove excess water & nitrogen waste (ammonia, NH3)
NERVOUS SYSTEM   like earthworms     VENRAL NERVE CORD     CEREBRAL GANGLIA (brain)     GANGLIA along body
VENTRAL NERVE CORD
CEREBRAL GANGLIA =            BRAINNerves connectthe eyes, antennae,and antennulesto the brain.
BrainBrain
AUTOTOMY &REGENERATION        Crayfish have the         ability to         “self amputate” parts         to escape predato...
THE END
Crayfish dissection
Crayfish dissection
Crayfish dissection
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Crayfish dissection

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Crayfish dissection

  1. 1. CRAYFISHDISSECTION
  2. 2. Animal GroupsImage from: http://ology.amnh.org/biodiversity/treeoflife/pages/graph.html
  3. 3. ARTHROPODA “Arthro” = jointed “pod” = foot
  4. 4. Arthropods
  5. 5. Structures to identify in lab• All terns in the powerpoint that are printed in RED.
  6. 6. Classifying CrayfishKingdom: ANIMALIAPhylum: ARTHROPODAClass: CRUSTACEA
  7. 7. EXOSKELETON- Outside body; NON-LIVINGMade of CHITIN (polysaccharide with some nitrogen)
  8. 8. All animals with an EXOSKELETONmust MOLT (shed their exoskeleton) to grow bigger
  9. 9. SEGMENTED BODY like earthworms
  10. 10. Fusion of smaller segments to make one bigger section Head + thorax = cephalothorax
  11. 11. CARAPACEPart of exoskeleton that covers the cephalothorax
  12. 12. CHELIPED = Pincher (defense; capture food)ROSTRUM = “visor” protects eyes
  13. 13. COMPOUND EYEHAS MULTIPLE LENSES
  14. 14. ANTENNAE- touch, tasteANTENNULES- touch,taste, & equilibrium
  15. 15. Statocyst
  16. 16. DECAPODS (10 legs)(4 pair walking legs + 2 chelipeds)
  17. 17. SWIMMERETS (5 pair)
  18. 18. SWIMMERETSAid in reproductionIn males – transfer spermIn females – carry eggs/young Create water currents
  19. 19. TelsonUropods Uropods Uropods Telson
  20. 20. MAXILLA – Manipulate food
  21. 21. LAST PAIR of MAXILLA = “BAILERS”Keep water moving over gills
  22. 22. MANDIBLE
  23. 23. Appendages1. Walking legs2. Cheliped3. Maxillipeds4. 2nd maxilla (gill bailer)5. 1st maxilla6. Mandible7. Antenna8. Antennule
  24. 24. APPENDAGESANTENNA Touch, tasteANTENNULE Touch, taste, equilibriumMANDIBLE Chew foodMAXILLA Manipulate food Last pair “bailers”- Move water over gillsMAXILLIPEDS Touch, taste, manipulate foodCHELIPED Capture food, defenseWALKING LEGS Locomotion, move water over gillsSWIMMERETS Move water over EGGS, transfer sperm (males) carry young/eggs (females)UROPOD Propulsion during tailflips
  25. 25. Is it a MALE OR FEMALE?MALES:first two pairof swimmeretsform a channelto transfersperm to femaleseminal receptacle
  26. 26. SWIMMERETS MALES Top pair make a “V”
  27. 27. Females “in berry”carry developing embryos on swimmerets
  28. 28. REPRODUCTIVESEPARATE SEXES Male and FemaleEXTERNAL FERTILIZATION sperm & eggs join outside bodyINDIRECT DEVELOPMENT Starts as a larva
  29. 29. INDIRECT DEVELOPMENTMOLLUSKS ECHINODERMS CRUSTACEANSTROCHOPHORE BIPINNARIA NAUPLIUS
  30. 30. Examine the inside of your crayfish
  31. 31. RESPIRATORYGILLS (#2) Exchange gases Remove nitrogen waste (AMMONIA)
  32. 32. What keeps water moving over gills?“BAILERS”WALKING LEGS:are attached to gills so walking moveswater Image from: http://www.aa.psu.edu/div/mns/biology/crayfish/crayfishtable.htm
  33. 33. INTERNAL Heart Stomach Digestive gland
  34. 34. OPEN CIRCULATORY SYSTEMHEART with openings (OSTIA)ARTERIES leaving heart but NO VEINS to return hemolymph
  35. 35. OSTIA
  36. 36. ADDUCTOR MUSCLES run mouthparts
  37. 37. STOMACHPYLORIC CARDIAC
  38. 38. GASTRIC MILL“teeth” inside stomach
  39. 39. DIGESTIVE GLANDMakes bile; finishes digestion; absorbs nutrients
  40. 40. GONADS (produces sex cells)
  41. 41. Females: OVARIES – make eggs SEMINAL RECEPTACLES - store received spermMales: TESTES – make sperm VAS DEFERENS- tubules inside that carry sperm from testes to exit openingENDOCRINE SYSTEM: controls sexual development Also: molting, heart rate
  42. 42. ABDOMENINTESTINE (#4) – finish digestion; absorb nutrients; collect & remove feces
  43. 43. GREEN GLANDS (#2) - collect and remove excess water & nitrogen waste (ammonia, NH3)
  44. 44. NERVOUS SYSTEM like earthworms VENRAL NERVE CORD CEREBRAL GANGLIA (brain) GANGLIA along body
  45. 45. VENTRAL NERVE CORD
  46. 46. CEREBRAL GANGLIA = BRAINNerves connectthe eyes, antennae,and antennulesto the brain.
  47. 47. BrainBrain
  48. 48. AUTOTOMY &REGENERATION Crayfish have the ability to “self amputate” parts to escape predators and regenerate to repair injuries
  49. 49. THE END

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