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This is a massive sponge forming rounded lumps up to 30cm in diameter. It is often inconspicuous due to being covered with silt and overgrown by other sponges, tunicates, etc. The surface is rough to the touch and if cut a well-developed, spicule packed rind 3mm in thickness is clearly differentiated fronm the softer creamy interior. Easily confused with Stryphnus ponderosus which has a thinner surface rind and is usually more encrusting.


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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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