Part 6: Sclerosponges & Stromatoporoids

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4 Terms

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Q: What are chaetetids (sclerosponges)?

A: Encrusting, laminar sponges with calcareous or siliceous skeletons, once thought to be corals

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Q: What are stromatoporoids?

A: Layered sponges with astrorhizae (grooves) and mamelons (bumps), reef-builders in Silurian–Devonian

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Q: What happened to stromatoporoids?

A: Declined after the Devonian extinction, resurfaced in the Mesozoic, thought extinct after Cretaceous but related living sclerosponges were later found

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