Porifera

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  • Multicellular Body with pores (ostia) No organs or true tissues. No nervous system Adults sessile & attached to substratum. Skeleton of calcareous spicules , siliceous spicules , spongin or a combination. All aquatic, mostly marine.
  • Composed of 3 layers outer layer of flattened contractile cells (pinacocytes) inner non-living mesoglea containing a variety of specialized cells collar cells (choanocytes) which capture food, etc. from water flowing through channels. Exhibit asymmetry or radial symmetry . Reproduction - asexual by buds & gemmules. Sexual by eggs & sperm.
  • Calcium carbonate = chalk and limestone Silicon = sand (silicon dioxide) Collagen = main protein of connective tissue and changed into gelatin.
  • Fig. 12.11a
  • Large sponges filter 1500 liters/day *How important are they to the ocean environment? what would happen if there were too many? Too few? Choanocytes phagocytize Archeocytes digest No respiratory, excretory or nervous systems

Transcript

  • 1. Phylum Porifera
  • 2. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Simple Sponge Morphology
  • 3. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Sponge Body Forms
  • 4. Spicule
    • Skeleton of sponge
      • Calcium carbonate
      • Silicon
      • Collagen
  • 5. Archeocyte
    • Amoeboid cells
    • Receive food from choanocytes
    • Differentiate into other cell types
  • 6. Mesenchyme (Mesoglea or Mesohyl)
    • Gelantinous matrix
  • 7. Pinococyte
    • Outer surface of sponge
    • Contractile
  • 8. Choanocyte
    • Flagellated cells
    • One end in mesnchyme
    • Flagella creates water currents
    • Collar traps food
    • Passes food to archeocyte
  • 9. Porocyte
    • Forms a pore
  • 10. Asconoid Sponge Ostium Spongocoel Osculum Porocyte
  • 11. Syconoid Sponge Osculum Ostium Spongocoel Choanocytes Radial Canal Incurrent Canal
  • 12. Syconoid Sponge Spongocoel Ostium Choanocytes Radial Canal Incurrent Canal Scypha ( Grantia) xs
  • 13. Leuconoid Sponge Choanocyte chamber Osculum Incurrent canal Excurrent canal Incurrent pore
  • 14. Class Calcarea Grantia
    • Small
    • Vase shape
    • Spicules of calcium carbonate
      • Straight or 3-4 rays
  • 15. Class Hexactinellida Euplectella
    • Spicules
      • Siliceous
      • 6 rays
  • 16. Class Demospongiae Spongia
    • Spicules
      • Siliceous
      • spongin
  • 17.  
  • 18. Physiology
  • 19. Sexual Reproduction
    • Monoecious
      • Both male and female
    • Sperm and egg derived from choanocytes
    • Ciliated larva
      • Swim to new location
  • 20.
    • Budding
    • Fragmentation
    • Gemmule formation
    • -survive freezing
    Asexual Reproduction Micropyle Spicule