Porifera identification

GLE

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I have a fossil siliceous sponge from Australia which possibly still exists in the Indo-Pacific equatorial zone in association with Enhalus acoroides and Odontaspis sp. (assuming these two species sometimes occur together).

Would anyone have any idea of the type of sponge this might be?

The sponge seems to begin as small blobs before growing a thick skin over sandy sediments, giving rise to isolated clumps which look like great big boulders. Other times it will simply be a ledge on valley slopes. The skin looks sort of like the inside of a crunchy bar.

Its original position is estimated to have been intertidal.
 

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