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Sponges & Cnidarians Phylum Porifera • Sponges – Simplest animals, multicellular – No organs or body systems – Asymmetry – Cellular digestion – Feed by filtering water – Do not move – Reproduce sexually and asexually Sponge Anatomy Osculum: large opening at top; water exits Collar Cells (Choanocytes); layer of cells with flagella that move water and digest food Ectoderm: outer layer Jellylike Cells (Amebocytes); move inside to supply nutrients, carry away wastes, form sperm and eggs Pore (Ostia); where water enters Spikes (Spicules): rigid frame for support Phylum Cnidaria • Cnidarians (Jellyfish, Hydra, Sea Anemone, Coral, Portuguese Man-of-War) – Tentacles with stinging cells (Cnidocytes) • Venom paralyzes fish (prey) • Pull food into the mouth – – – – Food goes into a central cavity Specialized tissues help them move (swim, flip, shrink, bend) Symmetry: Radial or Asymmetry Reproduce • Asexually (budding) • Sexually (both sexes in one animal or separate) Cnidarian Anatomy Body Plans Polyp (stationary/vase shaped) Medusa (swimming/cup-shaped) Hydra Jellyfish Coral Portuguese Sea Anemone Man-of-War Assignment #17: Sponges • Draw a Diagram to show how water travels through a sponge (use arrows) – Answer the following: • • • • How do pores help a sponge feed? How do collar cells help a sponge feed? What is the function of the osculum? Why is a sponge classified as an animal?