The organisation of such sponges differs greatly due to different degrees of folding in the body wall. Scypha or sycon as formerly known is a more complex type than Leucosolenia since Leucosolenia is a primitive asconoid type with no folding in its body wall, while Scypha's body wall is folded and therefore its spongocoel is comparatively smaller. At the tip, the water exits through an oscule, or wider opening. Each "finger," known as a radial canal, in syconoid sponges is perforated by many tiny pores through which water passes into a single central cavity. Scypha, also known as sycon, is a genus of marine sponges belonging to the class Calcarea hence referred to as calcareous sponges that are distinguished by the syconoid form of structure, which has a fingerlike body shape.
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