Phylum Porifera
I wonder how much deeper the ocean would be without sponges?

  1. Porifera Main.
  2. Introduction to the Porifera. More is here.
  3. Sponge
  4. Get a Venus' Flower Basket here
  5. SpongeBob and homosexuality
 

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Spongilla gemmules

  

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Class Calcarea (Leucosolenia)

  

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Sulphur sponge

 

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Class Demospongae
 

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Class Hexactinellida

  

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Branching Tube Sponge

  

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Sponge Dumping Gametes

  

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Yellow Tube Sponge
 

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Hexactinellid Sponge

  

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Sponge Fossils