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Platyhelminthes

Platyhelminthes. Kim Paul Emelie Poirier Chloe Raitt Hailey Reagh. Introduction. Platyhelminthes Flatworms 20,000+ known species Range in length Feed on animal material, algae Bilaterally symmetrical 3 cell layers Mostly hermaphroditic Live everywhere Moist environments .

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Platyhelminthes

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  1. Platyhelminthes Kim Paul Emelie Poirier Chloe Raitt Hailey Reagh

  2. Introduction • Platyhelminthes • Flatworms • 20,000+ known species • Range in length • Feed on animal material, algae • Bilaterally symmetrical • 3 cell layers • Mostly hermaphroditic • Live everywhere • Moist environments

  3. Evolution • Soft, small bodies don’t produce a well fossilized record. • Schistosome larvae, oldest subspecies found, discovered in Egyptian Mummies. • Nothing concrete found before them. • Believed to have first appeared around 550 MYA.

  4. Evolution • Biochemical aspects used to determine Tree of Life. • Still discrepencies in Tree of Life with taxon relationships. • Parasitic subgroup (Trematoda, Monogenea, and Cestoda) are believed to be monophyletic • Acoela are believed to have a different ancestor.

  5. Classification • Phylum – Platyhelminthes • Greek words • Platy for flat • Helminthes for worm • Classes • Cestoda (parasitic tapeworms) • Trematoda (parasitic flukes) • Turbellaria (free living Planaria)

  6. Major Subgroups

  7. Turbellaria • Free-living group • Mostly benthic and marine • Over 4000 species

  8. Trematoda • Group of parasites • 9000 species have been discovered • Worm-like or flattened oval • Human liver flukes and blood flukes

  9. Cestoda • Parasites • 5000 known species • Long and flat bodies

  10. Characteristics • Unsegmented bodies • Lack of skeletal system • Lack of circulatory system • Lack of body cavity • Locomotion • Nervous system • Digestive system

  11. Fun Facts! • Both salt water and freshwater • Tolerant of pollution • Come in great lengths • Withstand starvation • Simplest form of the worm • Regenerate • Reproduce sexually and asexually

  12. References • Platyhelminthes. Gerlinger, Friedrich. Web. http://home.arcor.de/gerber.7/platyhelminthes.htm • Flatworm – Parasites. O’Shea, Lorraine. Web. http://poster.4teachers.org/view/poster.php?poster_id=379778 • Ramel, Gordon (n.d). The Phylum Platyhelminthes. Earthlife. March 4, 2013, from http://www.earthlife.net/inverts/platyhelminthes.html • Target Informatics Pvt. Ltd. (2013). Platyhelminthes. Target Study. March 4, 2013, from http://targetstudy.com/nature/animals/platyhelminthes/ • http://www.ucmp.berkeley.edu/platyhelminthes/platyhelminthes.html • http://www.naturwissenschaften.be/en/institute/associations/rbzs_website/bjz/back/pdf/BJZ%20131%28s1%29/Volume%20131%28s1%29,%20pp.%2035-46.pdf
http://www.cisneros-heredia.org/infotrans/usfq/zoologia/pdfs/rohde2001.pdf • Campbell, A. 2001. "Turbellaria" (On-line), Animal Diversity Web. Accessed March 06, 2013 at http://animaldiversity.ummz.umich.edu/accounts/Turbellaria/ • Myers, P. 2001. "Trematoda" (On-line), Animal Diversity Web. Accessed March 06, 2013 at http://animaldiversity.ummz.umich.edu/accounts/Trematoda/ • Myers, P. 2001. "Cestoda" (On-line), Animal Diversity Web. Accessed March 06, 2013 at http://animaldiversity.ummz.umich.edu/accounts/Cestoda/ • McDarby, Michael. (2001-2013). Flatworms(Platyhelminthes). An Online Introduction to the Biology of Animals and Plants. March 6, 2013, from http://faculty.fmcc.suny.edu/mcdarby/animals&plantsbook/animals/03-Flatworms.htm

  13. Photos • http://species.wikimedia.org/wiki/Platyhelminthes • http://planet.uwc.ac.za/nisl/biodiversity/loe/page_20.htm • http://quizlet.com/4357176/platyhelminthes-nematodes-rotifers-flash-cards/ • http://skepticalsquirrel.wordpress.com/2012/07/28/backwards-before-we-go-forwards/ • http://egy-king.blogspot.ca/2012/09/ancient-egyptian-mummies.html • http://www.rzuser.uni-heidelberg.de/~bu6/Introduction11.html • http://www.elasmodiver.com/images/flat-worm.jpg • http://sharonapbio-taxonomy.wikispaces.com/Animalia-Platyhelminthes • http://www.richard-seaman.com/Underwater/Philippines/Nudibranchs/index.html • http://www.starfish.ch/c-invertebrates/flatworms.html • http://biodidac.bio.uottawa.ca/thumbnails/filedet.htm?File_name=Trem054p&File_type=gif • http://eol.org/pages/2885/overview • http://www.rzuser.uni-heidelberg.de/~bu6/pow.html • http://www.dscc.edu/bwilliams/biology%201120/biol_1120_lab_animals • http://fineartamerica.com/featured/a-beautiful-flatworm-feeds-on-algae-terry-moore.html • http://www.darwinsgalapagos.com/animals/platyhelminthes_flatworms.htm • http://www.waterworxbali.com/flatworms.shtml • http://www.tranquil-seas.com/?_escaped_fragment_=portfolio

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