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 A large rounded sponge up to 15 cm in diameter and height up to 10 cm. The consistency is firm-hard, but slightly compressible. The smooth surface is bluish or violet-grey and extensively perforated with inhalant orifices. Larger exhalant openings (osculum) are distinct and usually in lines or arranged in clusters. The skin (cortex) is distinct and 1 mm thick, underneath the surface the colour is yellow-white.


Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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