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This spherical or hemispherical sponge can reach a diameter of 6 cm. Live specimens are white. The surface is even, but with a rough, hairy looking texture. It usually have only one or two oscules (openings).


It is found on rocky substrate deeper than 15 metres, but more frequently below 40 metres.


This sponge is reported from most coastlines around the North-East Atlantic, from the Arctic to the British Isles.