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Platyhelminthes: Fat Worms

Soft, unsegmented, flattened worms with internal organ systems and tissues Simplest animal to have three embryonic layers, bilateral symmetry, and cephalization. Platyhelminthes: Fat Worms. By Mikinley, Maddie, Merritt. Bilateral. Symmetry. Bilateral.

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Platyhelminthes: Fat Worms

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  1. Soft, unsegmented, flattened worms with internal organ systems and tissues • Simplest animal to have three embryonic layers, bilateral symmetry, and cephalization Platyhelminthes: Fat Worms By Mikinley, Maddie, Merritt

  2. Bilateral Symmetry Bilateral

  3. Debris and tissues of dead or almost dead animals • Feed by extracting bodily juices from prey using scolex mouth that can latch on to food Feeding Detritivore: animal which feeds off of dead organic materials

  4. Diffusion Circulation

  5. Food goes through the mouth and is digested using its pharynx in a Gastrovascular Cavity Excretion Flame Cells

  6. Complex structures • External environment • Does Not have a complex nervous system • CNS runs between two nerve cords on both of its sides Response

  7. Those that live on land use muscle cells to move body • Those that live in water use cilia to swim Movement Muscle Cells and Cilia

  8. Reproduce both sexually and asaexually • Both the male and female reproductive organs can be found in a single flatworm (Hermaphrodite) • These organs are stored in the proglottid Reproduction

  9. Diffusion • No lungs or circulatory system • Cells close to the surface of the skin Respiration

  10. Trematoda • Cestoda • Planarians • Monogenea Name of classes and example 4 major classes

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