1. CRAYFISH DISSECTION
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2. ARTHROPODA
“jointed foot”
“Arthro” =
“pod” =
joint
foot

5. NAMING CRAYFISH Kingdom: Phylum: CLASS: ANIMALIA Arthropoda
“jointed foot”
CRUSTACEA
crusta = “flexible shell”

6. SEGMENTED BODY

7. TAGMA- pl TAGMATA Head + thorax = cephalothorax
Fusion of smaller segments to make one bigger section
Head + thorax = cephalothorax

8. http://biog-101-104. bio. cornell
EXOSKELETON- (flexible) made of CHITIN (polysaccharide) PROTEINS, LIPIDS, CALCIUM CARBONATE

9. CARAPACE Section of exoskeleton covering cephalothorax
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Section of exoskeleton covering cephalothorax

10. http://biog-101-104. bio. cornell
CHELIPED
ROSTRUM

11. COMPOUND EYE

12. Antennae
Antennules
ANTENNAE- touch, taste
ANTENNULES- touch, taste,
& EQUILIBRIUM

13. DECAPODS (10 legs) (4 pair walking legs + 2 chelipeds)
DECAPODS (10 legs) (4 pair walking legs + 2 chelipeds)

14. SWIMMERETS (5 pair)

15. Telson Uropods Image from:

16. MANDIBLE

17. Mouthparts Mandible Maxilla Maxillipeds (3 pairs) Image from:

18. Appendages Walking legs Cheliped 3. Maxillipeds
Walking legs
Cheliped
3. Maxillipeds
4. 2nd maxilla (gill bailer)
5. 1st maxilla
6. Mandible
7. Antenna
Antennule

19. 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

20. Is it a MALE OR FEMALE?
MALES: first two pair of swimmerets form a channel to transfer sperm to female seminal receptacle
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21. SEMINAL RECEPTACLE & SWIMMERETS
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22. Females “in berry” carry developing embryos on swimmerets

23. REPRODUCTIVE SEPARATE SEXES Male and Female EXTERNAL FERTILIZATION
sperm & eggs join outside body
INDIRECT DEVELOPMENT
Starts as a LARVA

24. INDIRECT DEVELOPMENT MOLLUSKS ECHINODERMS CRUSTACEANS TROCHOPHORE
BIPINNARIA
NAUPLIUS
 Trochophore image:
Nauplius image:
Bipinnaria image:

25. Examine the inside of your crayfish

26. GILLS RESPIRATORY Exchange gases remove nitrogen waste (AMMONIA)
Exchange gases remove nitrogen waste (AMMONIA)
GILLS

27. Image from: http://faculty. clintoncc. suny. edu/faculty/Michael
Protostomes/protostomes.htm

28. GILLS are attached to base of walking legs.
Last pair of maxilla = “bailers” & walking move water over gills
Image from:

30. GAS EXCHANGE IN GILLS

31. INTERNAL

34. CIRCULATORY Image from:

35. OPEN CIRCULATORY SYSTEM
HEART with openings (OSTIA)
ARTERIES leaving heart but NO VEINS to return hemolymph

36. OSTIA Movie from: http://www.gsu.edu/~bioasx/heartbeat.html
Image from:
Movie from:

37. PYLORIC
CARDIAC

38. GASTRIC MILL “teeth” inside stomach

39. DIGESTIVE 3. DIGESTIVE GLAND 4. ADDUCTOR muscles move mouthparts
5. STOMACH
DIGESTIVE
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40. ABDOMEN
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41. 3. Digestive (hepatopancreas) gland. 4. adductor muscle 5. stomach
2. Heart
3. Digestive (hepatopancreas) gland.
4. adductor muscle
5. stomach
Image from:

42. GREEN GLANDS collect and remove nitrogen waste (AMMONIA) and excess water
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43. NERVOUS VENRAL NERVE CORD CEREBRAL GANGLIA GANGLIA along body
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44. NERVOUS
Pair of nerves lead from the ventral nerve cord around the esophagus to the large ganglion, or brain, in the head.  Short nerves connect the eyes, antennae, and antennules to the brain. 

45. COMPOUND EYE

46. http://biog-101-104. bio. cornell
Thousands of SENSORY HAIRS project from exoskeleton over entire body sense vibrations & chemicals