CRAYFISH DISSECTION. Image from:

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CRAYFISH DISSECTION. Image from:

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Transcription:

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

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

http://biog-101-104.bio.cornell.edu/biog101_104/tutorials/animals/crayfish.html EXOSKELETON- Outside body; NON-LIVING Made of CHITIN (polysaccharide) PROTEINS, LIPIDS, CALCIUM CARBONATE

All animals with an EXOSKELETON must MOLT (shed their exoskeleton) to grow bigger http://crayfish.byu.edu/crayfish_biology.htm

SEGMENTED BODY like earthworms http://io.uwinnipeg.ca/~simmons/images/lb7fig6a.gif

TAGMA- pl TAGMATA Fusion of smaller segments to make one bigger section Head + thorax = cephalothorax

CARAPACE Image from: http://rcs.rome.ga.us/hargett/biology/arthpod/craydia.htm Part of exoskeleton that covers the cephalothorax

Image by Riedell/VanderWal 2005 CHELIPED = Pincher (defense; capture food) ROSTRUM = visor protects eyes

COMPOUND EYE HAS MULTIPLE LENSES

Image by Riedell/VanderWal 2005 ANTENNAE- touch, taste ANTENNULES- touch, taste, & EQUILIBRIUM

Image by Riedell/VanderWal 2005 DECAPODS (10 legs) (4 pair walking legs + 2 chelipeds)

SWIMMERETS (5 pair) Image by Riedell/VanderWal 2005

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

Image by Riedell/VanderWal 2005 Telson Uropods

Maxillipeds Touch, taste, manipulate food Image by Riedell/VanderWal 2006

MAXILLA Manipulate food http://www.flushing.k12.mi.us/srhigh/tippettl/biology/cray/maxventral.html

LAST PAIR of MAXILLA = BAILERS Keep water moving over gills http://www.flushing.k12.mi.us/srhigh/tippettl/biology/cray/maxventral.html

MANDIBLE http://www.flushing.k12.mi.us/srhigh/tippettl/biology/cray/mandible.html

http://biog-101-104.bio.cornell.edu/biog101_104/tutorials/animals/crayfish.html Appendages 1. Walking legs 2. Cheliped 3. Maxillipeds 4. 2 nd maxilla (gill bailer) 5. 1 st maxilla 6. Mandible 7. Antenna 8. Antennule

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

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

SWIMMERETS Images by Riedell/VanderWal 2005 MALES Top pair make a V

Females in berry carry developing embryos on swimmerets http://crayfish.byu.edu/crayfish_biology.htm

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

INDIRECT DEVELOPMENT MOLLUSKS ECHINODERMS CRUSTACEANS TROCHOPHORE 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:

Examine the inside of your crayfish

RESPIRATORY Image by Riedell/VanderWal 2005 GILLS Exchange gases Remove nitrogen waste (AMMONIA)

Image by Riedell/VanderWal 2005

What keeps water moving over gills? BAILERS Image by Riedell/VanderWal 2005 WALKING LEGS: are attached to gills so walking moves water

GAS EXCHANGE IN GILLS DIFFUSION MOVES HIGH LOW

INTERNAL

OPEN CIRCULATORY SYSTEM Image by Riedell/VanderWal 2005 HEART with openings (OSTIA) ARTERIES leaving heart but NO VEINS to return hemolymph

OSTIA Image from: http://www.quia.com/jg/265982list.html Movie from: http://www.gsu.edu/~bioasx/heartbeat.html

ADDUCTOR MUSCLES run mouthparts Image by Riedell/VanderWal 2005

STOMACH PYLORIC CARDIAC Image by Riedell/VanderWal 2005

GASTRIC MILL teeth inside stomach http://www.occ.cccd.edu/faculty/mperkins/zoo-review/crayfish/crayfish4.html

DIGESTIVE GLAND Image by Riedell/VanderWal 2005 Makes bile; finishes digestion; absorbs nutrients

GONADS http://www.flushing.k12.mi.us/srhigh/tippettl/biology/cray/gonad.html

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

ABDOMEN INTESTINE finish digestion; absorb nutrients; collect & remove feces Image by Riedell/VanderWal 2005

Freshwater critters live in a HYPOTONIC environment http://www.emc.maricopa.edu/faculty/farabee/biobk/biobooktransp.html

GREEN GLANDS - collect and remove excess water & nitrogen waste (AMMONIA) Image by Riedell/VanderWal 2005

NERVOUS SYSTEM like earthworms http://www.student.loretto.org/zoology/graphic%20webs/crayfish%20nervous%20system.htm VENTRAL NERVE CORD CEREBRAL GANGLIA GANGLIA along body

VENTRAL NERVE CORD Image by Riedell/Vanderwal 2005

CEREBRAL GANGLIA = BRAIN Nerves connect the eyes, antennae, and antennules to the brain. http://www.flushing.k12.mi.us/srhigh/tippettl/biology/cray/ganganterior.html

COMPOUND EYE

Image by Riedell/VanderWal 2005 Thousands of SENSORY HAIRS project from exoskeleton over entire body sense vibrations & chemicals

Image by Riedell/VanderWal 2005 AUTOTOMY & REGENERATION Crayfish have the ability to self amputate parts to escape predators and regenerate to repair injuries

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