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Sponges Discussion

Sponges Discussion. April 26, 2011. Classification. Kingdom – Animalia Phylum – Porifera. Basic Characteristics. Sessile – do not move No specialized tissues or organs Asymmetrical. 4. Body Structure. Vase-like wall around a hollow tube – closed at bottom and open at top

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Sponges Discussion

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  1. Sponges Discussion April 26, 2011

  2. Classification • Kingdom – Animalia • Phylum – Porifera

  3. Basic Characteristics • Sessile – do not move • No specialized tissues or organs • Asymmetrical

  4. 4. Body Structure • Vase-like wall around a hollow tube – closed at bottom and open at top • Water comes through pores (porocytes) on side and leaves through osculum at top - important for respiration, getting food and getting rid of wastes

  5. 4. Body Structure (cont.) • Have specialized cells called choanocytes (AKA collar cells) that move water through and trap food • Have specialized cells (amebocytes) that move carrying food and removing wastes • Structure – made of spongin (protein fibers) and spicules (needlelike structures)

  6. 5. Reproduction • Asexual – budding (part of existing fragment), regeneration (pieces growing into new sponges) • Sexual – sperm released, go into pores of another sponge, amebocytes transfer sperm to egg • New zygote develops flagella and swims away • Grows on new surface

  7. 6. Diversity • Very old • 8000 know species • 3% in freshwater • Very diverse in where they live (depth), size and color • Classified by what they are made of (type of cells)

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