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Platyhelminthes

BSC 2011L. Platyhelminthes. Animal Characteristics. Symmetry Radiata – radial symmetry, diploblastic (2 tissues) Bilateria – bilateral symmetry, triploblastic Body Cavity Acoelomates – no cavity Psuedocoelomates – false coelom , not completely lined by mesoderm derived tissue

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Platyhelminthes

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  1. BSC 2011L Platyhelminthes

  2. Animal Characteristics • Symmetry • Radiata – radial symmetry, diploblastic (2 tissues) • Bilateria – bilateral symmetry, triploblastic • Body Cavity • Acoelomates – no cavity • Psuedocoelomates – false coelom, not completely lined by mesoderm derived tissue • Coelomates – true coelom, room for organs in body cavity lined with mesoderm tissue • Protostomes – 1st embryonic opening becomes mouth • Deuterostomes – 1st embryonic opening becomes anus

  3. Phylum Platyhelminthes • Flatworms • Can be free living or parasitic • Hermaphroditic • Acoelomates • One opening • Digestion – gastrovascular cavity • Circulation – gastrovascular cavity

  4. Phylum Platyhelminthes

  5. Phylum PlatyhelminthesClass Turbullaria • Animal: Planaria • Symmetry: Bilateral • Body cavity: acoelomate • Digestion: gastrovascular cavity • Circulation: gastrovascular cavity • Segmentation: none • Appendages: none • Nervous: brain, 2 ventral nerve cords, ladder-like • Habitat: aquatic • Respiration: diffusion • Excretion: flame cells • Locomotion: muscles • Support: none

  6. Planaria model

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