Presentation is loading. Please wait.

Presentation is loading. Please wait.

CRAYFISH DISSECTION Image from:

Similar presentations


Presentation on theme: "CRAYFISH DISSECTION Image from:"— Presentation transcript:

1 CRAYFISH DISSECTION Image from:

2 Animal Groups Image from:

3 ARTHROPODA “Arthro” = “pod” = joint foot “jointed foot”

4

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

6 EXOSKELETON- Outside body; NON-LIVING Made of CHITIN (polysaccharide) PROTEINS, LIPIDS, CALCIUM CARBONATE

7 All animals with an EXOSKELETON must MOLT (shed their exoskeleton) to grow bigger

8 SEGMENTED BODY like earthworms

9 Fusion of smaller segments to make one bigger section Head + thorax = cephalothorax

10 CARAPACE Part of exoskeleton that covers the cephalothorax Image from:

11 CHELIPED = Pincher (defense; capture food) ROSTRUM = “visor” protects eyes

12 COMPOUND EYE HAS MULTIPLE LENSES

13 ANTENNAE- touch, taste ANTENNULES- touch, taste, & equilibrium

14 Statocyst

15 DECAPODS (10 legs) (4 pair walking legs + 2 chelipeds)

16 SWIMMERETS (5 pair)

17 SWIMMERETS HELP with REPRODUCTION Males – transfer sperm Females – carry eggs/young Create water currents

18 Telson Uropods Image from:

19 MAXILLA – Manipulate food

20 LAST PAIR of MAXILLA = “BAILERS” Keep water moving over gills

21 MANDIBLE

22 Appendages 1.Walking legs 2. Cheliped 3. Maxillipeds 4. 2 nd maxilla (gill bailer) 5. 1 st maxilla 6. Mandible 7. Antenna 8.Antennule

23 APPENDAGES ANTENNATouch, taste ANTENNULETouch, taste, equilibrium MANDIBLEChew food MAXILLAManipulate food Last pair “bailers”- Move water over gills MAXILLIPEDSTouch, taste, manipulate food CHELIPEDCapture food, defense WALKING LEGSLocomotion, move water over gills SWIMMERETSMove water over EGGS, transfer sperm (males) carry young/eggs (females) UROPODPropulsion during tailflips

24 Is it a MALE OR FEMALE? MALES: first two pair of swimmerets form a channel to transfer sperm to female seminal receptacle Image from:

25 SWIMMERETS MALES Top pair make a “V”

26 Females “in berry” carry developing embryos on swimmerets

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

28 INDIRECT DEVELOPMENT MOLLUSKS ECHINODERMS CRUSTACEANS TROCHOPHOREBIPINNARIANAUPLIUS Trochophore image: Nauplius image: Bipinnaria image:

29 Examine the inside of your crayfish

30 GILLS RESPIRATORY Exchange gases Remove nitrogen waste (AMMONIA)

31 Image from: Protostomes/protostomes.htm

32 What keeps water moving over gills? “BAILERS” WALKING LEGS: are attached to gills so walking moves water Image from:

33 INTERNAL

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

35 OSTIA Image from: Movie from:

36 ADDUCTOR MUSCLES run mouthparts

37 PYLORIC CARDIAC STOMACH

38 GASTRIC MILL “teeth” inside stomach

39 DIGESTIVE GLAND Makes bile; finishes digestion; absorbs nutrients

40 GONADS

41 Females: OVARIES – make eggs SEMINAL RECEPTACLES-store received sperm Males: TESTES – make sperm VAS DEFERENS- tubules inside that carry sperm from testes to exit opening ENDOCRINE SYSTEM: controls sexual development Also: molting, heart rate

42 ABDOMEN INTESTINE – finish digestion; absorb nutrients; collect & remove feces

43 GREEN GLANDS - collect and remove excess water & nitrogen waste (AMMONIA)

44 NERVOUS SYSTEM like earthworms VENRAL NERVE CORD CEREBRAL GANGLIA GANGLIA along body

45 VENTRAL NERVE CORD Image by Riedell/Vanderwal © 2005

46 CEREBRAL GANGLIA = BRAIN Nerves connect the eyes, antennae, and antennules to the brain.

47 COMPOUND EYE

48 AUTOTOMY & REGENERATION Crayfish have the ability to “self amputate” parts to escape predators and regenerate to repair injuries

49 THE END

50

51 Thousands of SENSORY HAIRS project from exoskeleton over entire body sense vibrations & chemicals

52 Freshwater critters live in a HYPOTONIC environment

53 GAS EXCHANGE IN GILLS


Download ppt "CRAYFISH DISSECTION Image from:"

Similar presentations


Ads by Google