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Lower animals

Lower animals. Sponges Cnidarians Unsegmented worms. Sponges. Phylum: Porifera. Form & Function. Body wall around central cavity Pores. Water moves in by flagella on collar cells H 2 O moves out of osculum. Make-up. Spicule skeleton CaCo 3 or SiO 2 Spongin protein.

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Lower animals

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  1. Lower animals • Sponges • Cnidarians • Unsegmented worms

  2. Sponges Phylum: Porifera

  3. Form & Function • Body wall around central cavity • Pores

  4. Water moves in by flagella on collar cells • H2O moves out of osculum

  5. Make-up • Spicule skeletonCaCo3 or SiO2 • Spongin protein

  6. Life processes • Filter feeders • Water flow • Excretory, respiratory& internal transport

  7. Reproduction • Sexual • Gemmules • Like a spore • Budding

  8. Nervous system • No brains • No feelings

  9. In the world • Shrimp snails worms bacteria live in, on, and under them

  10. People uses • Bath sponges • Medicines • Natural toxins against bacteria

  11. Phylum: Cnidaria

  12. What are they • Soft bodied animals • Tentacles around the mouth

  13. 2 stages of Life • Polyp • stationary stage • Medusa • Motile bell-shape

  14. Polyp stage

  15. Medusa stage

  16. Digestion & Feeding • Gastrovascular cavity • Nematocysts • Use photosynthesis

  17. Nervous system • No brain • Nerve net on mouth • For feeding

  18. Class:Hydrozoa • Hydra • Usually polyps • Some hermaphrodites • Ex. Portuguese man-o-war

  19. Class:Scyphozoa • Jellyfish • Most harmless Cause pain • Few can Kill

  20. Class:Anthozoa • Anenomes & corals • In tide pools • Make-up reefs

  21. Cnidarians in the world • Reef ecosystems • medicines

  22. Unsegmented worms • Platyhelminthes • Flatworms • Nematoda • Roundworms

  23. Platyhelminthes • Platy • flat • Helminth • worm

  24. Platyhelminthes Simplest animals with bilateral symmetry

  25. Lifestyles of the Flat and simple Brained • Free-living • Parasites

  26. Free-living • Eat with mouth & pharynx • Excrete through mouth

  27. Parasites • Absorb digested nutrients • Pharynx- intestinal sac

  28. Circulation • No circulatory system • Diffusion used to transport

  29. Nervous system • Simple brain • Long nerve cord • Ocelli eye spot

  30. Examples • Planarians

  31. Examples • Flukes

  32. Examples • Tapeworms

  33. Phylum:Nematoda Roundworms

  34. Life-styles… • Both Parasites & free-living • Round tube shaped w/ both mouth and anus

  35. Circulation • No internal transport • Goes through body wall

  36. Nervous system • No Brains • Ganglia nerves • Detect chemicals and movement

  37. Reproduction • Sexual- must be inside host to reproduce.

  38. IN the world • Hookworm- enter the foot • Trichonosis • Trichinella

  39. Filarial Worms-Circulatory and Lymphatic System

  40. exploded intestine

  41. Pinworms

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