1 / 16

Platyhelminthes

Platyhelminthes. Emily, Azaria, Chris Period 5. General Description. Phylum- Platyhelminthes contains flatworms Soft, unsegmented, & flat (no more than a few mm thick) Tissues (tripoblastic) & internal organ systems

ostinmannual
Download Presentation

Platyhelminthes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Platyhelminthes Emily, Azaria, Chris Period 5

  2. General Description • Phylum- Platyhelminthes contains flatworms • Soft, unsegmented, & flat (no more than a few mm thick) • Tissues (tripoblastic) & internal organ systems • Simplest animals to have: 3 embryonic germ layers, bilateral symmetry, & cephalization • Do not have coeloms (body cavity) • Live in fresh or marine water • Most of their oxygen through diffusion

  3. Symmetry • No body cavity- aceolomates • Bilateral symmetry • Gastrovascular cavity with one opening • Some breath through skin

  4. Feeding • Parasites- enter body of other organisms, can absorb and consume what the host eats • 80% are free living • Turbellaria- carnivores (tiny aquatic invertebrates)

  5. Circulation • Flatworms take in oxygen and release carbon dioxide • Flatworms don’t undergo cellular respiration • Flatworms undergo diffusion to obtain the oxygen they need, and release carbon dioxide they don’t • This is mostly the reason why they’re flat Central nervous system: the complex of nerve tissues that controls the activities of the body.

  6. Excretion • The digestive cavity has only one opening for both intake of food and the excretion of it • As a result the food cannot be processed continuously • Cilia help move foods to be digested and then excreted through their mouths Pharynx: the membrane-lined cavity behind the nose and mouth, connecting them to the esophagus. Flame cell: a specialized excretory cell- function like a kidney, removing waste materials.

  7. Response • They have ganglia • Have a complex structure for detecting and responding to external stimuli • Have eyespots that can detect changes in the amount of light in their environment • Have specialized cells that detect external stimuli

  8. Movement • Free-living • Uses cilia and muscle cells

  9. Reproduction • Most are hermaphrodites • Reproduce sexually with internal fertilization • Parasitic • Commonly reproduce asexually by fission • Can reproduce sexually

  10. Respiration • Gas exchange • Uses diffusion

  11. Classes of Platyhelminthes • Trematoda • Turbellaria • Cestoda

  12. Trematoda • Parasites • Infect animals and humans • Specialized body (Parasitic life) • Fasciola hepatica (Liver fluke)

  13. Turbellaria • Free living flatworms • Most are aquatic • Some are terrestrial • Planaria

  14. Cestoda • Tape worms • Intestinal parasites • Proglottid: segment containing complete reproductive system • Taenia solium (Pork tapeworm)

  15. https://www.shapeoflife.org/video/flatworms-first-hunter https://excreting101.weebly.com/platyhelminthes.html Works Cited

  16. The End

More Related