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Mollusca

Mollusca. Lovepreet Kaur Priya Patel. Number of germ layers. Endoderm- Innermost layer of cells and tissue of embryo Ectoderm- Outermost layer Mesoderm- Middle layer. Symmetry. Bilateral- only one plane. Coelom. Body cavity lined with mesoderm Very small. Digestive Tract.

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Mollusca

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  1. Mollusca LovepreetKaur Priya Patel

  2. Number of germ layers • Endoderm- Innermost layer of cells and tissue of embryo • Ectoderm- Outermost layer • Mesoderm- Middle layer

  3. Symmetry • Bilateral- only one plane

  4. Coelom • Body cavity lined with mesoderm • Very small

  5. Digestive Tract • Complete with mouth, anus and stomach

  6. Cephalization Mollusca have a concentrated nervous system

  7. Segmentation • Foot- bottom layer • Visceral mass- middle part that holds organs • Mantle- outer top layer

  8. Skeleton and Appendages • Exoskeleton • Appendages vary: antennae, legs, tentacles

  9. Circulatory system • Open circulatory system in which the blood travels through the gills to the heart

  10. Respiratory system • Oxygenates through gills with direct contact to water

  11. Reproduction Occurs sexually with separate sexes and external fertilization

  12. Habitat • Sea • Freshwater • Terrestrial environment (land)

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