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Platyhelminthes Kim Paul Emelie Poirier Chloe Raitt Hailey Reagh.

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Presentation on theme: "Platyhelminthes Kim Paul Emelie Poirier Chloe Raitt Hailey Reagh."— Presentation transcript:

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2 Platyhelminthes Kim Paul Emelie Poirier Chloe Raitt Hailey Reagh

3 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

4 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.

5  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. Evolution

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

7 Major Subgroups Turbellaria Trematoda Cestoda

8 Turbellaria  Free-living group  Mostly benthic and marine  Over 4000 species

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

10 Cestoda  Parasites  5000 known species  Long and flat bodies

11 Characteristics  Unsegmented bodies  Lack of skeletal system  Lack of circulatory system  Lack of body cavity  Locomotion  Nervous system  Digestive system

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13 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

14 References  Platyhelminthes. Gerlinger, Friedrich. Web.  Flatworm – Parasites. O’Shea, Lorraine. Web.  Ramel, Gordon (n.d). The Phylum Platyhelminthes. Earthlife. March 4, 2013, from  Target Informatics Pvt. Ltd. (2013). Platyhelminthes. Target Study. March 4, 2013, from   back/pdf/BJZ%20131%28s1%29/Volume%20131%28s1%29,%20pp.% pdf heredia.org/infotrans/usfq/zoologia/pdfs/rohde2001.pdf back/pdf/BJZ%20131%28s1%29/Volume%20131%28s1%29,%20pp.% pdf heredia.org/infotrans/usfq/zoologia/pdfs/rohde2001.pdf  Campbell, A "Turbellaria" (On-line), Animal Diversity Web. Accessed March 06, 2013 at  Myers, P "Trematoda" (On-line), Animal Diversity Web. Accessed March 06, 2013 at  Myers, P "Cestoda" (On-line), Animal Diversity Web. Accessed March 06, 2013 at  McDarby, Michael. ( ). Flatworms(Platyhelminthes). An Online Introduction to the Biology of Animals and Plants. March 6, 2013, from Flatworms.htm Flatworms.htm

15 Photos     forwards/ forwards/      seaman.com/Underwater/Philippines/Nudibranchs/index.html seaman.com/Underwater/Philippines/Nudibranchs/index.html   e_type=gif e_type=gif     moore.html moore.html   


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