• Asconoid Type - Water entering the sponge passes through ostia which are actually openings within doughnut-shaped cells called porocytes, which are found only in asconoid sponges. The water enters the large central cavity called the spongocoel, which is lined with choanocytes. Water exits from the spongocoel through a single large osculum.











• Syconoid Type - Water enters the sponge through ostia which are openings between cells, rather than within cells as in asconoid sponges. Water then passes into radially arranged incurrent canals which lead to flagellated chambers lined with choanocytes. Water leaves the flagellated chambers by way of excurrent canals that lead to the spongocoel, which is lined a simple flat epithelium. Water exits from the spongocoel by way of a single large osculum. Note that the body wall of syconoid sponges is thicker than that of asconoid sponges and that the syconoid spongocoel is not lined by choanocytes......

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Title: Plant Lab
Approximate Word Count: 629
Approximate Pages: 3 (250 words per double-spaced page)

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