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  Leucosolenia  (Class Calcarea)

Lab_3b-01a

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This is a slide of a simple marine sponge called Leucosolenia.  This tubular sponge has an ascon body plan in which water kept in motion by the action of flagellated choanocytes enters the central spongocoel through dermal pores and exits through a single osculum.  The skeleton of Leucosolenia consists of calcium carbonate projections called spicules embedded in a tough protein called spongin.