Notes on Platyhelminthes - Basic Facts 1 ~20,000 species 2...

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Basic Facts 1. ~20,000 species 2. Dorsoventrally flattened 3. Size range from 1mm to 15m 4. Most are parasitic 5. Free living species marine or freshwater 6. Free living species carnivorous or scavengers 7. Bilateral 8. 3 germ layers 9. Acoelmate 10. Protostome Bilateral 1. Superclade within? 1. Eumetazoa 2. Bilateral Symmetry 1. Single axis of symmetry runs along longitudinal body 2. Possess both
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Unformatted text preview: dorsoventral and anterior-posterior polarity 3. Radial Symmetry 1. Multiple axis of symmetry 2. Possess one polarity oral-aboral 4. Bilateria Develop true organ systems 1. Organ systems from 3 germ layers 1. Ectoderm-epidermis, nervous system 2. Mesoderm-muscle, bone, gonads, circulatory system Endoderm- lining of digestive and respiratory system...
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  • Spring '10
  • Kant
  • germ layers, 15M, 1mm, endoderm

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