Decline in Mesozoic reef-building sponges explained by silicon limitation

@article{Maldonado1999DeclineIM,
  title={Decline in Mesozoic reef-building sponges explained by silicon limitation},
  author={Manuel Maldonado and M. Carmen. Carmona and Mar{\'i}a Jes{\'u}s {\'U}riz and Antonio Cruzado},
  journal={Nature},
  year={1999},
  volume={401},
  pages={785-788}
}
Several unrelated clades of siliceous sponges proliferated on the shelves of the Jurassic Tethys Sea, becoming prominent builders in reefs and near-shore mounds. Many of these builders are characterized by massive, rock-like skeletons made of spicules with a characteristic terminal hypersilicification. Such hypertrophied spicules are generically known as desmas, irrespective of their phylogenetic origin. Desma-bearing sponges virtually disappeared from reefs and other neritic environments… 

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