Dead sponges become covered in sediment, but do not lose their supportive siliceous skeleton.
2.
The siliceous skeleton of the sponges is fragile, and these organisms are easily broken by physical impact.
3.
They are distinguished by a siliceous skeleton of two and four rayed spicules and contain the protein spongin.
4.
This is likely because the sponges possess very little organic tissue; the siliceous skeleton accounts for 90 % of the sponge body weight.
5.
Breakage of reef sponges may have dire consequences for the recruitment of new sponges, as sponge larvae require the siliceous skeletons of past generations as a substrate.
6.
Rosselid sponges have a " woven " or " loose " siliceous skeleton that does not persist after the death of the sponge, and are capable of forming mats, but not reefs.
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