1. WORM DISSECTION

3. NAMING Kingdom: Phylum: Class: ANIMALIA Annelida “little rings” OLIGOCHAETA “few bristles” (=SETA pl: SETAE)

4. SETA (plural: setae) http://www.pgjr.alpine.k12.ut.us/science/whitaker/Animal_Kingdom/Earthworm/Earthworm.html BRISTLES on VENTRAL surface

5. SETAE- Provide traction http://www.dof.virginia.gov/images/anim-worm-crawl.gif

6. 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

8. WHICH END IS WHICH? CLITELLUM = ring Doesn’t go all the way around Closest to anterior end Makes mucous for reproduction

9. 2 opening digestive system MOUTH ANUS Prostomium 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

10. EXTERNAL STRUCTURES PROSTOMIUM

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

12. CUTICLE (non-cellular protective layer) http://www.flushing.k12.mi.us/srhigh/tippettl/biology/lum/cuticle.html

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

14. EXTERNAL STRUCTURES

15. SEXUAL REPRODUCTION

16. SEXUAL REPRODUCTION EXTERNAL FERTILIZATION

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

18. LOOK INSIDE

19. COELOM = space around organs http://www.flushing.k12.mi.us/srhigh/tippettl/biology/lum/vessel.html

20. INTERNAL STRUCTURES EUCOELOMATES “true” coelom http://www.biologie.uni-hamburg.de/b-online/library/onlinebio/annelidbodyxs.gif

21. SEPTUM (pl. SEPTA) Dividing walls separate coelom into compartments Fluid in coelom provides support = HYDROSKELETON

22. INTERNAL STRUCTURES NEPHRIDIUM pl. NEPHRIDIA EXCRETORY TUBULES http://www.pleasanton.k12.ca.us/avhsweb/thiel/apbio/review/excretory.html

23. INTERNAL STRUCTURES

24. SEMINAL VESICLES STORE SPERM TO GIVE AWAY

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

26. CLOSED circulatory system DORSAL BLOOD VESSEL VENTRAL BLOOD VESSEL

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

28. Image from: http://www.urbanext.uiuc.edu/worms/anatomy/anatomy6.html

29. INTERNAL STRUCTURES http://sps.k12.ar.us/massengale/earthworm_dissection.htm

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

31. INTESTINE absorbs nutrients ADAPTATIONS for eating “SOIL” REALLY LONG so food spends long time passing through TYPHLOSOLE- increases surface area for more absorption

32. TYPHLOSOLE Ridge inside intestine It increases surface area so more nutrients are absorbed http://www.uleth.ca/bio/bio1020/images/worm2.jpg

33. SEGMENTED WORMS Return nutrients to soil by decomposing dead leaves and organic matter 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

34. VENTRAL NERVE CORD VENTRAL BLOOD VESSEL Underneath digestive system http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/earthworm.html

35. CEREBRAL GANGLIA=“brain” http://biog-101-104.bio.cornell.edu/BioG101-104/tutorials/animals/earthworm.html

36. INTERNAL STRUCTURES Image from: http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20102/Bio%20102%20lectures/Animal%20 Diversity/Protostomes/mollusks.htm#Chelicerates%20(subphylum%20Chelicerata

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