Main Characteristics

  • Body with many pores, canals or chambers through which water flows is called the canal system.
  • Large aperture called osculum at the upper end.
  • Body encloses a large cavity spongocoel.
  • No organs, movable parts or appendages. Different kinds of cells perform different functions.
  • Usually with an internal skeleton of calcareous or siliceous spicules, or of spongin fibres, or both.
  • Reproduction asexual by budding; also sexual.
  • Almost all marine.