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Phylum Porifera-

  • Members of this phylum are commonly known as sponges. Mostly marine, asymmetrical and have cellular level of organization.
  • They have water transport or canal system. Water enters through minute pores, Ostia into central cavity Spongocoel, from where it goes out through Osculum.
  • Nutrition, respiration and excretion is performed by pathway of water transport system.
  • Skeleton made up of spicules or spongin fibres.
  • Egg and sperms are produced by same organism (hermaphrodite). Asexual reproduction by fragmentation and sexual reproduction by gametes formation.
  • Fertilisation internal and development is indirect.
  • Example– Sycon, Spongilla.
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