CRAYFISH DISSECTION. Image from:
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1 CRAYFISH DISSECTION Image from:
2 ARTHROPODA jointed foot Arthro = joint pod = foot
3 Animal Groups Image from:
4
5 NAMING CRAYFISH Kingdom: Phylum: ANIMALIA Arthropoda jointed foot CLASS: 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 TAGMA- pl TAGMATA Fusion of smaller segments to make one bigger section Head + thorax = cephalothorax
10 CARAPACE Image from: Part of exoskeleton that covers the cephalothorax
11 Image by Riedell/VanderWal 2005 CHELIPED = Pincher (defense; capture food) ROSTRUM = visor protects eyes
12 COMPOUND EYE HAS MULTIPLE LENSES
13 Image by Riedell/VanderWal 2005 ANTENNAE- touch, taste ANTENNULES- touch, taste, & EQUILIBRIUM
14 Image by Riedell/VanderWal 2005 DECAPODS (10 legs) (4 pair walking legs + 2 chelipeds)
15 SWIMMERETS (5 pair) Image by Riedell/VanderWal 2005
16 SWIMMERETS HELP with REPRODUCTION Males transfer sperm Females carry eggs/young Create water currents
17 Image by Riedell/VanderWal 2005 Telson Uropods
18 Maxillipeds Touch, taste, manipulate food Image by Riedell/VanderWal 2006
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 ANTENNA ANTENNULE MANDIBLE MAXILLA MAXILLIPEDS CHELIPED WALKING LEGS SWIMMERETS UROPOD Touch, taste Touch, taste, equilibrium Chew food Manipulate food Last pair bailers - Move water over gills Touch, taste, manipulate food Capture food, defense Locomotion, move water over gills Move water over EGGS, transfer sperm (males) carry young/eggs (females) Propulsion 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 by Riedell/VanderWal 2005
25 SWIMMERETS Images by Riedell/VanderWal 2005 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 TROCHOPHORE BIPINNARIA NAUPLIUS Trochophore image: Nauplius image: Bipinnaria image:
29 Examine the inside of your crayfish
30 RESPIRATORY Image by Riedell/VanderWal 2005 GILLS Exchange gases Remove nitrogen waste (AMMONIA)
31 Image by Riedell/VanderWal 2005
32 What keeps water moving over gills? BAILERS Image by Riedell/VanderWal 2005 WALKING LEGS: are attached to gills so walking moves water
33
34 GAS EXCHANGE IN GILLS DIFFUSION MOVES HIGH LOW
35 INTERNAL
36 OPEN CIRCULATORY SYSTEM Image by Riedell/VanderWal 2005 HEART with openings (OSTIA) ARTERIES leaving heart but NO VEINS to return hemolymph
37 OSTIA Image from: Movie from:
38 ADDUCTOR MUSCLES run mouthparts Image by Riedell/VanderWal 2005
39 STOMACH PYLORIC CARDIAC Image by Riedell/VanderWal 2005
40 GASTRIC MILL teeth inside stomach
41 DIGESTIVE GLAND Image by Riedell/VanderWal 2005 Makes bile; finishes digestion; absorbs nutrients
42 GONADS
43 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
44 ABDOMEN INTESTINE finish digestion; absorb nutrients; collect & remove feces Image by Riedell/VanderWal 2005
45 Freshwater critters live in a HYPOTONIC environment
46 GREEN GLANDS - collect and remove excess water & nitrogen waste (AMMONIA) Image by Riedell/VanderWal 2005
47 NERVOUS SYSTEM like earthworms VENTRAL NERVE CORD CEREBRAL GANGLIA GANGLIA along body
48 VENTRAL NERVE CORD Image by Riedell/Vanderwal 2005
49 CEREBRAL GANGLIA = BRAIN Nerves connect the eyes, antennae, and antennules to the brain.
50 COMPOUND EYE
51 Image by Riedell/VanderWal 2005 Thousands of SENSORY HAIRS project from exoskeleton over entire body sense vibrations & chemicals
52 Image by Riedell/VanderWal 2005 AUTOTOMY & REGENERATION Crayfish have the ability to self amputate parts to escape predators and regenerate to repair injuries
CRAYFISH DISSECTION. Image from:
CRAYFISH DISSECTION Image from: http://www.mackers.com/crayfish/ Animal Groups Image from: http://ology.amnh.org/biodiversity/treeoflife/pages/graph.html ARTHROPODA jointed foot Arthro = joint pod = foot
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