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Tetilla cranium is a spherical sponge, typically the size of a golf ball. It is a frequent species in deep water but rarely found in depths which divers can reach. The surface is conulose and there is usually a group of osculae at the top which are flush with the surface. Tethya citrina is similar in appearance but has a much rougher surface. It is common.


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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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