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Platyhelminthes

Platyhelminthes. By: Wade Sandry. Key Characteristics. Bilaterally Symmetrical. Body has 3 layers of tissues with organs and organelles. Body contains no internal cavity. Possesses a blind gut. (mouth but no butt) Has P rotonephridial excretory organs instead of a butt.

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Platyhelminthes

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  1. Platyhelminthes By: Wade Sandry

  2. Key Characteristics • Bilaterally Symmetrical. • Body has 3 layers of tissues with organs and organelles. • Body contains no internal cavity. • Possesses a blind gut. (mouth but no butt) • Has Protonephridial excretory organs instead of a butt. • Has a nervous of long fibers not a net. • Generally flattened look. • Sexual reproduction • Feeds on animals and smaller life forms • Occur in all major habitats

  3. Anatomy • Incudes • Brain • Eye • Sensory lobe • Ventrolateral Nerve • Intestine • Pharynx • Mouth

  4. Digestion • Incomplete digestive system. • These don’t have an anus. • This means it takes in food and excretes it from the same hole.

  5. Respiration • It takes in oxygen but doesn’t have a formal respiratory system • Has no circulatory system so is simple diffusion.

  6. Internal Transport • Gastro vascular cavity reaching very close to every cell in the body.

  7. Excretion • They consume and excrete out of the same hole.

  8. Response • Eye spots to detect the change in lighting. • Senses to detect the direction of water flow. • The nervous system helps detect food and hiding spots.

  9. Movement • Some have cilia-water/ liquids • Muscle cells-twist

  10. Reproduction • Both • Sexual reproduction • A-sexual reproduction

  11. Examples • Cestoda • Tapeworms • Monogenea • Small Flatworms • Trematoda • Flukes • Turbellaria • Usually fresh water.

  12. Facts • Simplest animal with 3 cell layers. • Around 20,000 thousand species. • One fluke can produce 500,000 embryos • Over 10,000 types of flukes. • Have bilateral symmetry.

  13. Literature Cited • http://www.earthlife.net/inverts/platyhelminthes.html • http://www.biologycorner.com/bio1/notes_flatworms.html • http://www.mcwdn.org/Animals/Flatworm.html • http://www.biologycorner.com/bio1/notes_flatworms.html • http://faculty.fmcc.suny.edu/mcdarby/Animals&PlantsBook/Animals/03-Flatworms.htm • http://poster.4teachers.org/view/poster.php?poster_id=379778

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