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Giant barrel sponge
The giant barrel sponge (''Xestospongia muta'') is the largest species of sponge found growing on Caribbean coral reefs. It is common at depths greater than down to and can reach a diameter of 1.8 metres (6 feet). It is typically brownish-red to brownish-gray in color, with a hard or stony texture. The giant barrel sponge has been called the "redwood of the reef" because of its size and estimated lifespan of hundreds to a thousand or more years. It is perhaps the best-studied species of sponge in the sea; a population on Conch Reef, in the Florida Keys, has been monitored and studied since 1997.
==Description==
The giant barrel sponge is variable in form.〔 Typically it is barrel-shaped, with a cone-shaped cavity at the apex known as the osculum. However, some individuals within the same population may be low and squat or relatively tall and thin. Similarly, the surface can range from smooth to rough, rugged, and irregular, sometimes with buttresses.〔 In shallow water the color is brownish-red to brownish-gray, but at greater depths and in caves and under-hangs, or when the sponge is undergoing cyclic bleaching events, the sponge is pinkish or white.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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