Cray Fish Dissection!!!
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Transcript of 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