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Individual siliachoates (silica skeleton scaffolding) can be arranged tightly within the sponginocyte or crosshatched and fused together. Siliceous spicules come in two sizes called megascleres and microscleres.
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became so successful that they significantly decreased the amount of silica present in sea water, after which "siliceous sponges could never again form reefs."
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During the
Triassic, siliceous sponges grew reefs similar to calcarea of the modern era. During the Cretaceous period,
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Siliceous sponges are usually found in the marine ecosystem but they are occasionally found in freshwater.
243:"Evaluating hypotheses of basal animal phylogeny using complete sequences of large and small subunit rRNA"
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Mónica Medina, Allen G. Collins, Jeffrey D. Silberman & Mitchell L. Sogin (August 14, 2001).
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The group, as a part of the phylum
Porifera, has been named
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is a proposed new phylum based on molecular studies of the
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Most studies support the monophyly of siliceous sponges.
370:(4th ed.). WH Freeman and Company. p. 424.
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366:Stanley, Steven; Luczaj, John (2015).
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38:Hexactinellid spicule
368:Earth System History
259:2001PNAS...98.9707M
166:Schmidt, 1862 and
145:calcareous sponges
24:Siliceous sponges
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61:Eukaryota
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199:Calcarea
179:Porifera
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