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Chapter 24 and 25

Chapter 24 and 25. Sponges, Cnidarians, Flatworms, and Roundworms. Basketball sponge. Cinachyra sponge. Phylum Porifera (“pore-bearer”). ~Includes all sponges (grantia, scypha, & leucosolenia). Knob sponge. Simplest animals Asymmetrical. Red sponge. Volcano sponge. Phylum Porifera.

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Chapter 24 and 25

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  1. Chapter 24 and 25 Sponges, Cnidarians, Flatworms, and Roundworms

  2. Basketball sponge Cinachyra sponge Phylum Porifera (“pore-bearer”) ~Includes all sponges (grantia, scypha, & leucosolenia)

  3. Knob sponge • Simplest animals • Asymmetrical

  4. Red sponge Volcano sponge Phylum Porifera • Aquatic • Sessile - can’t move from place to place • Filter feeders

  5. Dead man’s finger sponge Phylum Porifera • Reproduce both sexually and… • Asexually * Regeneration – reattach * Budding - grow new sponges

  6. Phylum Porifera Sponge dumping gametes Phylum Porifera • Hermaphrodites -produce both eggs and sperm

  7. Phylum Porifera • Osculum - opening on some sponges • Spicules - sharp, hard, needle-like structures - attachment

  8. Green anemone Brain coral Jellyfishes Phylum Cnidaria (“nettles” / tentacles) Includes jellyfishes, corals, sea anemones & hydras

  9. Flower pot coral Purple anemone Phylum Cnidaria • Aquatic • Radial symmetry

  10. Torch coral Sun coral Phylum Cnidaria • Nerve net - a simple nervous system

  11. Nematocysts - tubes in tentacles - contains poison

  12. Gastrovascular cavity - primitive stomach

  13. Monterey, CA

  14. Medusa Red cauliflower coral Moon jelly Phylum Cnidaria • Two basic body forms • Polyp - tube shaped body • Medusa - body shaped like an umbrella

  15. Sea anemone Staghorn coral Pineapple coral Club tipped anemone

  16. Corals

  17. Budding hydra Hydra releasing sperm Hydra releasing an egg • Reproduce: • Sexually - hermaphrodites • Asexually - budding

  18. PHYLUM: PLATYHELMINTHES(“flat worms”) • Includes: • Tapeworms & liver flukes (Parasitic) • Planarians (Free-living) • Bilateral symmetry

  19. (PHYLUM: PLATYHELMINTHES) • Some have eyespots • Scolex - head of a tapeworm • Proglottid - body part

  20. LIFE CYCLES: May involve two or more hosts. • Most have digestive systems • Exception: Tapeworms (TAPEWORM LIFE CYCLE)

  21. Life Cycle of a Liverfluke

  22. PHYLUM: NEMATODA(“Thread” / Roundworms)

  23. PHYLUM: NEMATODA • Includes: • Ascaris (Roundworms) • Pin worms • Trichina worms • Hookworms • The above are parasitic • Most are free-living

  24. PHYLUM: NEMATODA • Bilateral symmetry • Some are hermaphrodites

  25. LIFE CYCLE OF A ROUNDWORM

  26. PARASITIC WORMS

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