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This is a very distinctive spherical sponge, varying in size from a large pea to 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 one oscule with a raised rim. Two other spherical species of Tetilla are reported from the area, Tetilla cranium and Tetilla infrequens. The common species Tethya citrina is similar in shape but yellow in colour.


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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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