Cray Fish Dissection!!!

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    CRAYFISH

    DISSECTION

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    Animal Groups

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    ARTHROPODA

    Arthro =

    pod =

    joint

    foot

    jointed foot

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    NAMING CRAYFISH

    Kingdom:

    Phylum:

    CLASS:

    ANIMALIA

    Arthropodajointed foot

    CRUSTACEA

    crusta = flexible shell

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    EXOSKELETON- Outside body; NON-LIVING

    Made of CHITIN (polysaccharide)

    PROTEINS, LIPIDS, CALCIUM CARBONATE

    http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html

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    All animals with an EXOSKELETON

    must MOLT (shed their exoskeleton)

    to grow bigger

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    SEGMENTED BODY

    like earthworms

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    Fusion of smaller segments to make

    one bigger section

    Head + thorax = cephalothorax

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    CARAPACE

    Part of exoskeleton that

    covers the cephalothorax

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

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    COMPOUND EYE

    HAS MULTIPLE LENSES

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    ANTENNAE- touch, taste

    ANTENNULES- touch,

    taste, & equilibrium

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    Statocyst

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    DECAPODS (10 legs)

    (4 pair walking legs + 2 chelipeds)

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    SWIMMERETS (5 pair)

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    SWIMMERETS

    HELP with

    REPRODUCTION

    Malestransfer sperm

    Femalescarry eggs/young

    Create water currents

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    Telson

    Uropods

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    MAXILLAManipulate food

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    LAST PAIR of MAXILLA = BAILERS

    Keep water moving over gills

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    MANDIBLE

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    Appendages

    1. Walking legs2. Cheliped

    3. Maxillipeds

    4. 2nd maxilla(gill bailer)

    5. 1st maxilla

    6. Mandible

    7. Antenna

    8. Antennule

    APPENDAGES

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    APPENDAGESANTENNA 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 gillsSWIMMERETS Move water over EGGS,

    transfer sperm (males)

    carry young/eggs (females)

    UROPOD Propulsion during tailflips

    I it MALE OR FEMALE?

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    Is it a MALE OR FEMALE?MALES:

    first two pairof swimmerets

    form a channel

    to transfersperm to female

    seminal receptacle

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    SWIMMERETS

    MALES

    Top pair

    make aV

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    Females in berrycarry developing embryos on swimmerets

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    REPRODUCTIVE

    SEPARATE SEXES

    Male and Female

    EXTERNAL FERTILIZATION

    sperm & eggs join outside body

    INDIRECT DEVELOPMENTStarts as a LARVA

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    INDIRECT DEVELOPMENT

    MOLLUSKS ECHINODERMS CRUSTACEANSTROCHOPHORE BIPINNARIA NAUPLIUS

    Trochophore image: http://www.okc.cc.ok.us/biologylabs/Documents/Evolution/Trochophore_larva.htm

    Nauplius image: http://www.micrographia.com/specbiol/crustac/copepo/cope0100/cycnaup1.htm

    Bipinnaria image:

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    Examine the inside

    of your crayfish

    RESPIRATORY

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    RESPIRATORY

    Exchange gases

    Remove nitrogen waste (AMMONIA)

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    Wh t k t i ill ?

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    What keeps water moving over gills?

    BAILERS

    WALKING LEGS:

    are attached to gills so walking moveswater

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    INTERNAL

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    OPEN CIRCULATORY SYSTEM

    HEART with openings (OSTIA)

    ARTERIES leaving heart but NO VEINS to

    return hemolymph

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    OSTIA

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    ADDUCTOR MUSCLES

    run mouthparts

    STOMACH

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    PYLORIC

    CARDIAC

    STOMACH

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    GASTRIC MILLteeth inside stomach

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    DIGESTIVE GLAND

    Makes bile; finishes digestion; absorbs nutrients

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    GONADS

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    Females:

    OVARIESmake eggs

    SEMINAL RECEPTACLES-store received sperm

    Males:

    TESTESmake spermVAS DEFERENS- tubules inside that carry sperm

    from testes to exit opening

    ENDOCRINE SYSTEM:

    controls sexual development

    Also: molting, heart rate

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    ABDOMENINTESTINEfinish digestion; absorb nutrients;

    collect & remove feces

    GREEN GLANDS - collect and remove excess

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    GREEN GLANDS collect and remove excess

    water & nitrogen waste (AMMONIA)

    NERVOUS SYSTEM

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    NERVOUS SYSTEMlike earthworms

    VENRAL NERVE CORD

    CEREBRAL GANGLIA

    GANGLIA along body

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    VENTRAL NERVE CORD

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    CEREBRAL GANGLIA =

    BRAIN

    Nerves connect

    the eyes, antennae,and antennules

    to the brain.

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    COMPOUND EYE

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    AUTOTOMY &

    REGENERATIONCrayfish havethe ability to

    selfamputateparts to escapepredators andregenerate torepair injuries

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    THE END

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    Thousands of SENSORY HAIRS project fromexoskeleton over entire body sense vibrations &

    chemicals

    http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html

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    Freshwater critters live

    in a HYPOTONIC environment

    http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBooktransp.html

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    GAS EXCHANGE IN GILLS