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Phylum Porifera SPONGES

Phylum Porifera SPONGES. Sponges are classified as animals because they are multicellular, heterotrophic, have no cell walls, and contain a few specialized cells. Environment Aquatic Ecosystem Provide habitats for other marine animals

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Phylum Porifera SPONGES

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  1. Phylum Porifera SPONGES Sponges are classified as animals because they are multicellular, heterotrophic, have no cell walls, and contain a few specialized cells.

  2. Environment • Aquatic Ecosystem • Provide habitats for other marine animals • Commensalism /mutualism – form partnerships with photosynthetic bacteria, algae, and protists that provide food and oxygen Food Source • Filter Feeders • Digestion is intracellular

  3. Maintaining Homeostasis - Internal (Circulation, Respiration, Excretion) • Water moving through a sponge carries out body functions – carries nutrients and dissolved oxygen, removes wastes. Maintaining Homeostasis - External (Response) • No nervous system • Many make toxins to protect themselves

  4. Movement • Larva – carried by currents before they settle on ocean floor • Adult Sponges are sessile (do not move) Reproduction • Sexually or Asexually • Internal Fertilization Evolutionary Milestone • Multicellularity

  5. Vocabulary: • Internal Fertilization p666 • Larva p666 • Page 665 Figure 26-8 or picture below:

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