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WORM DISSECTION
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KIDSPIRATION by Riedell
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CLASSIFICATIONKingdom: Phylum:
Class:
ANIMALIA
Annelida“little rings”
OLIGOCHAETA “few bristles”
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SETA (plural: setae)
http://www.pgjr.alpine.k12.ut.us/science/whitaker/Animal_Kingdom/Earthworm/Earthworm.html
BRISTLES on VENTRAL surface
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SETAE- Provide traction
http://www.dof.virginia.gov/images/anim-worm-crawl.gif
http://www.greatbluemarble.com/robin_pulling_worm_ground_md_wht.gif
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Segmentation
Compartments allow
individual parts to move independently
Damage insurance If one section is
damaged, others can still function
http://sps.k12.ar.us/massengale/earthworm_dissection.htm
BIODIDAC
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Cartoon by:Gary Larson
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WHICH END IS WHICH?
CLITELLUM = ring• Doesn’t go all the way around• Closest to anterior end• Makes mucous for reproduction
Image by Riedell/VanderWal©2005
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2 opening digestive system
MOUTH ANUSProstomium
covers/protects mouth opening senses light/dark, chemicals (food), vibration
Image by Riedell/VanderWal©2005 Image by Riedell/VanderWal©2005
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EXTERNAL STRUCTURES
PROSTOMIUM
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EXTERNAL STRUCTURES
DORSAL BLOOD VESSELCAMOUFLAGE
http://biog-101-104.bio.cornell.edu/BioG101-104/tutorials/animals/earthworm.html
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CUTICLE(non-cellular protective
layer)
http://www.flushing.k12.mi.us/srhigh/tippettl/biology/lum/cuticle.html
http://www.flushing.k12.mi.us/srhigh/tippettl/biology/lum/cuticle.html
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RESPIRATORYNo respiratory organsSkin must stay moist for gas
exchangeGlands produce mucous
http://www.wildlifetrust.org.uk/cheshire/IMAGES/watch_earthworm.jpg
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SURVIVING HOT DRY CONDITIONS
Worms tunnel deeper into the soilRoll into a ballCover themselves with mucousSlow their body functions down
“Suspended animation” = ESTIVATIONWait for conditions to improve
http://www.backyardnature.net/earthwrm.htm
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SEXUAL REPRODUCTION Earthworms are
hermaphrodites
HAVE BOTH MALE & FEMALE REPRODUCTIVE ORGANS in same worm
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SEXUAL REPRODUCTION
OVARIES – make eggsTESTES- make sperm
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EXTERNAL STRUCTURES
MALE GENITAL PORE- releases sperm to give awayFEMALE GENITAL PORE- releases eggsOPENINGS to SEMINAL RECEPTACLES- receive sperm from other worms when trade
http://sps.k12.ar.us/massengale/earthworm_dissection.htm
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EXTERNAL STRUCTURES
SPERM GROOVE- carries sperm from MALE GENITAL PORE down to CLITELLUM
Image by Riedell/VanderWal©2005
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SEXUAL REPRODUCTION
Earthworms are HERMAPHRODITES BUT. . . DON’T fertilize themselves!
http://upload.wikimedia.org/wikipedia/commons/f/f6/Mating_earthworms.jpg
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SEXUAL REPRODUCTIONEXTERNAL FERTILIZATION
Produce COCOONSmade of MUCOUSand CHITIN(tough carbohydrate)
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Animated images from: http://www.urbanext.uiuc.edu/worms/anatomy/anatomy5.html
DIRECT DEVELOPMENT
http://blogs.salon.com/0003248/images/worm_cocoons.jpg
Earthworms produce between 4 - 70 cocoons per year.
Each cocoon may contain 2-20 embryos.
Baby worms hatch after a few weeks
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LOOK INSIDE
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COELOM = space around
organs
Image by Riedell/Vanderwal ©2005
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INTERNAL STRUCTURES
EUCOELOMATES “true” coelom
http://www.biologie.uni-hamburg.de/b-online/library/onlinebio/annelidbodyxs.gif
http://www.lander.edu/RSFOX/310images/310bilatImage.html
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SEPTUM (pl. SEPTA)
Dividing walls separate coelom into compartments
Image from: BIODIDAC
Image by Riedell/Vanderwal ©2005
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SKELETAL “hydrostatic skeleton”
Fluid in coelom protects organsand provides support
http://www.wildlifetrust.org.uk/cheshire/IMAGES/watch_earthworm.jpghttp://blog.tricerion.com/wp-content/uploads/2010/01/balloon.jpg
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EXCRETORY SYSTEM
NEPHRIDIUM
pl. NEPHRIDIAEXCRETORY TUBULES
http://www.pleasanton.k12.ca.us/avhsweb/thiel/apbio/review/excretory.html
Collect & excreteNITROGEN WASTE
Osmoregulation
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INTERNAL STRUCTURES
http://kentsimmons.uwinnipeg.ca/16cm05/16labman05/lb6pg3_files/wormnephridia.jpg
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REPRODUCTIVE SYSTEM
SEMINAL VESICLES
STORE SPERM MADE BY WORM TO “GIVE AWAY” TO OTHERS
Image by Riedell/Vanderwal©2005
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REPRODUCTIVE SYSTEM
SEMINAL RECEPTACLES
Store sperm received from other worms duringsex
Image by Riedell/Vanderwal©2005
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CLOSED circulatory system
DORSAL BLOOD VESSELVENTRAL BLOOD VESSEL
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DORSAL BLOOD VESSEL
Image by Riedell/Vanderwal ©2005
Images by Riedell/VanderWal©2005
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Image by Riedell/Vanderwal
5 AORTIC ARCHES act as “heart” to pump blood
Image by Riedell/Vanderwal ©2005
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Image from: http://www.urbanext.uiuc.edu/worms/anatomy/anatomy6.html
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INTERNAL STRUCTURES
http://sps.k12.ar.us/massengale/earthworm_dissection.htm
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PHARYNXPHARYNXMuscular tubepulls in food
Image by Riedell/Vanderwal ©2005
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CROP-stores food waiting to be digestedGIZZARD- grind and mash food
Image by Riedell/Vanderwal ©2005
INTERNAL STRUCTURES
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INTESTINE- absorbs nutrients
ADAPTATIONS for getting nutrients out of SOIL 1. REALLY LONG INTESTINE-
so food spends long time passing through 2. TYPHLOSOLE- ridge inside increases surface
area for more absorption
Images by Riedell/Vanderwal ©2005
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TYPHLOSOLE Ridge inside intestine
increases surface area so more nutrients are absorbed
http://www.uleth.ca/bio/bio1020/images/worm2.jpg
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TYPHLOSOLE inside intestine
Image by Riedell/Vanderwal ©2005
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Decompose organic matter(dead leaves, animal waste, etc)
Return nutrients to soil
Burrowing allows air and water to penetrate to roots
Tunnels loosen soil so roots can grow more easily
Earthworms play an important role in soil fertility
“intestines of the earth” ~ Aristotle
http://www.semioticon.com/seo/N/images/niche_3.png
"...it may be doubted if there are any other animals which have played such an important part in the history of the world as these lowly organized creatures." ~ Charles Darwin
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UNDERNEATH DIGESTIVE SYSTEM
VENTRAL NERVE CORD (nerves usually white)VENTRAL BLOOD VESSEL
(usually dark)
Image by: Riedell/Vanderwal © 2005
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REMEMBER embryo orientation is flipped in vertebrates and invertebrates!
Images modified from: http://io.uwinnipeg.ca/~simmons/16cm05/1116/16anim3.htm
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Most INVERTEBRATES have a DORSAL HEART & a VENTRAL NERVE CORD
ALL VERTEBRATES have a DORSAL NERVE CORD & a VENTRAL HEART.
BODY PLANS are also flipped!
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GANGLIA= nerve center
If in located in head and acting as “brain” = CEREBRAL GANGLIA
http://biog-101-104.bio.cornell.edu/BioG101-104/tutorials/animals/earthworm.html
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MUSCULAR SYSTEM
Image from: http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20102/Bio%20102%20lectures/Animal%20Diversity/Protostomes/mollusks.htm#Chelicerates%20(subphylum%20Chelicerata
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Image from: http://www.urbanext.uiuc.edu/worms/anatomy/anatomy8.html