Worm Dissection

Worm Dissection

WORM DISSECTION NAMING Kingdom: Phylum:

Class: ANIMALIA Annelida little rings OLIGOCHAETA

few bristles (=SETA pl: SETAE) SETA (plural: setae) BRISTLES on VENTRAL surface

http://www.pgjr.alpine.k12.ut.us/science/whitaker/Animal_Kingdom/Earthworm/Earthworm.html SETAE- Provide traction http://www.dof.virginia.gov/images/anim-worm-crawl.gif

Segmentation Compartments allow individual parts to move independently http://sps.k12.ar.us/massengale/earthworm_dissection.htm

BIODIDAC Damage insurance If one section is damaged, others can still function

WHICH END IS WHICH? CLITELLUM = ring Doesnt go all the way around Closest to anterior end

Makes mucous for reproduction 2 opening digestive system MOUTH Prostomium

ANUS covers/protects mouth opening senses light and dark/chemicals (food)

Images from: http://www.pgjr.alpine.k12.ut.us/science/whitaker/Animal_Kingdom/Earthworm/Earthworm.html EXTERNAL STRUCTURES PROSTOMIUM

EXTERNAL STRUCTURES http://biog-101-104.bio.cornell.edu/BioG101-104/tutorials/animals/earthworm.html DORSAL BLOOD VESSEL CAMOUFLAGE

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

EXTERNAL STRUCTURES http://sps.k12.ar.us/massengale/earthworm_dissection.htm HERMAPHRODITE have both male and female sex organs

EXTERNAL STRUCTURES SEXUAL REPRODUCTION SEXUAL REPRODUCTION

EXTERNAL FERTILIZATION DIRECT DEVELOPMENT Images from: http://www.urbanext.uiuc.edu/worms/anatomy/anatomy5.html

LOOK INSIDE COELOM = space around organs

http://www.flushing.k12.mi.us/srhigh/tippettl/biology/lum/vessel.html INTERNAL STRUCTURES http://www.biologie.uni-hamburg.de/b-online/library/onlinebio/annelidbodyxs.gif

EUCOELOMATES true coelom SEPTUM (pl. SEPTA) Dividing walls separate coelom into compartments

Fluid in coelom provides support = HYDROSKELETON INTERNAL STRUCTURES http://www.pleasanton.k12.ca.us/avhsweb/thiel/apbio/review/excretory.html

NEPHRIDIUM EXCRETORY TUBULES pl. NEPHRIDIA

INTERNAL STRUCTURES INTERNAL STRUCTURES SEMINAL VESICLES STORE SPERM TO GIVE AWAY

INTERNAL STRUCTURES http://biog-101-104.bio.cornell.edu/BioG101-104/tutorials/animals/earthworm.html SEMINAL RECEPTACLES store sperm received from other worms

CLOSED circulatory system DORSAL BLOOD VESSEL VENTRAL BLOOD VESSEL

AORTIC ARCHES = heart pump blood Image by Riedell/Vanderwal 2005 Image by Riedell/Vanderwal

Image from: http://www.urbanext.uiuc.edu/worms/anatomy/anatomy6.html INTERNAL STRUCTURES http://sps.k12.ar.us/massengale/earthworm_dissection.htm

INTERNAL STRUCTURES CROP-stores food waiting to be digested GIZZARD- grind and mash food

INTESTINE absorbs nutrients ADAPTATIONS for eating SOIL REALLY LONG so food spends long time passing through

TYPHLOSOLE- increases surface area for more absorption It increases surface area so more nutrients

are absorbed http://www.uleth.ca/bio/bio1020/images/worm2.jpg TYPHLOSOLE Ridge inside intestine

SEGMENTED WORMS Earthworms play an important role in soil fertility Return nutrients to soil by decomposing dead leaves and organic matter

intestines of the earth -Aristotle Burrowing allows air and water to penetrate to roots

Tunnels loosen soil so roots can grow more easily VENTRAL NERVE CORD VENTRAL BLOOD VESSEL http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/earthworm.html

Underneath digestive system CEREBRAL GANGLIA=brain http://biog-101-104.bio.cornell.edu/BioG101-104/tutorials/animals/earthworm.html

INTERNAL STRUCTURES 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

Image from: http://www.urbanext.uiuc.edu/worms/anatomy/anatomy8.html

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