CRAYFISH DISSECTION. Image from:
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1 CRAYFISH DISSECTION Image from:
2
3 Animal Groups Image from:
4 ARTHROPODA jointed foot Arthro = joint pod = foot
5
6 NAMING CRAYFISH Kingdom: Phylum: ANIMALIA Arthropoda jointed foot CLASS: CRUSTACEA crusta = flexible shell
7 EXOSKELETON- Outside body; NON-LIVING Made of CHITIN (polysaccharide) PROTEINS, LIPIDS, CALCIUM CARBONATE
8 All animals with an EXOSKELETON must MOLT (shed their exoskeleton) to grow bigger
9 SEGMENTED BODY like earthworms
10 Fusion of smaller segments to make one bigger section Head + thorax = cephalothorax
11 CARAPACE Part of exoskeleton that Image from: covers the cephalothorax
12 CHELIPED = Pincher (defense; capture food) ROSTRUM = visor protects eyes
13 COMPOUND EYE HAS MULTIPLE LENSES
14 ANTENNAE- touch, taste ANTENNULES- touch, taste, & equilibrium
15 Statocyst
16 DECAPODS (10 legs) (4 pair walking legs + 2 chelipeds)
17 SWIMMERETS (5 pair)
18 SWIMMERETS HELP with REPRODUCTION Males transfer sperm Females carry eggs/young Create water currents
19 Telson Uropods Image from:
20 MAXILLA Manipulate food
21 LAST PAIR of MAXILLA = BAILERS Keep water moving over gills
22 MANDIBLE
23 Appendages 1. Walking legs 2. Cheliped 3. Maxillipeds 4. 2 nd maxilla (gill bailer) 5. 1 st maxilla 6. Mandible 7. Antenna 8. Antennule
24 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
25 Is it a MALE OR FEMALE? MALES: first two pair of swimmerets form a channel to transfer sperm to female seminal receptacle Image from:
26 SWIMMERETS MALES Top pair make a V
27 Females in berry carry developing embryos on swimmerets
28 REPRODUCTIVE SEPARATE SEXES Male and Female EXTERNAL FERTILIZATION sperm & eggs join outside body INDIRECT DEVELOPMENT Starts as a LARVA
29 INDIRECT DEVELOPMENT MOLLUSKS ECHINODERMS CRUSTACEANS TROCHOPHORE BIPINNARIA NAUPLIUS Trochophore image: Nauplius image: Bipinnaria image:
30 Examine the inside of your crayfish
31 RESPIRATORY GILLS Exchange gases Remove nitrogen waste (AMMONIA)
32 Image from: Protostomes/protostomes.htm
33 What keeps water moving over gills? BAILERS WALKING LEGS: are attached to gills so walking moves water Image from:
34 INTERNAL
35 OPEN CIRCULATORY SYSTEM HEART with openings (OSTIA) ARTERIES leaving heart but NO VEINS to return hemolymph
36 OSTIA Image from: Movie from:
37 ADDUCTOR MUSCLES run mouthparts
38 STOMACH PYLORIC CARDIAC
39 GASTRIC MILL teeth inside stomach
40 DIGESTIVE GLAND Makes bile; finishes digestion; absorbs nutrients
41 GONADS
42 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
43 ABDOMEN INTESTINE finish digestion; absorb nutrients; collect & remove feces
44 GREEN GLANDS - collect and remove excess water & nitrogen waste (AMMONIA)
45 NERVOUS SYSTEM like earthworms VENRAL NERVE CORD CEREBRAL GANGLIA GANGLIA along body
46 VENTRAL NERVE CORD Image by Riedell/Vanderwal 2005
47 CEREBRAL GANGLIA = BRAIN Nerves connect the eyes, antennae, and antennules to the brain.
48 COMPOUND EYE
49 AUTOTOMY & REGENERATION Crayfish have the ability to self amputate parts to escape predators and regenerate to repair injuries
50 THE END
51
52 Thousands of SENSORY HAIRS project from exoskeleton over entire body sense vibrations & chemicals
53 Freshwater critters live in a HYPOTONIC environment
54 GAS EXCHANGE IN GILLS
CRAYFISH DISSECTION. Image from:
CRAYFISH DISSECTION Image from: http://www.mackers.com/crayfish/ ARTHROPODA jointed foot Arthro = joint pod = foot Animal Groups Image from: http://ology.amnh.org/biodiversity/treeoflife/pages/graph.html
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