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Phylum Porifera. Phylum Porifera. Sponges are the simplest animals Radially symmetrical Acoelomate Body resembles a perforated sac. Has inner cavity called spongocoel Has large opening called osculum Lining body are cells flagellated cells called choanocytes

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phylum porifera2
Phylum Porifera
  • Sponges are the simplest animals
  • Radially symmetrical
  • Acoelomate
    • Body resembles a perforated sac.
  • Has inner cavity called spongocoel
  • Has large opening called osculum
  • Lining body are cells flagellated cells called choanocytes
  • These cells beat to produce a flow of H20 into the sponge through pores in through the body wall, and out through the osculum.
  • Body wall is composed of many elements
  • Mesohyl - gelatenous material
  • Amoebocytes
    • Motile cells which perform many functions
    • Capture, digest and transport food
    • Create tough structural fibers of the body wall called spicules.
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