Xestospongia muta
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Xestospongia muta(Schmidt 1870)
This forms very large barrels, usually solitary but sometimes in clumps of two or three.

Colour is brown-grey to reddish.

The sponge texture is hard or stony, and its outer surface is very irregular and rough. The rough patterning on the outer surface consists of large, often sharp projections, commonly angled upwards. The lip also has jagged upward projections.