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Coscinodiscophycidae is a subcategory of diatoms. There are 571 species of Coscinodiscophycidae, in 40 genera and 18 families. It includes groups like Aulacoseiraceae and Arachnoidiscaceae. Dead Coscinodiscophycidae form siliceous oozes.

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  • URI: http://purl.obolibrary.org/obo/ENVO_02000044
  • Definition: Siliceous ooze is a marine sediment composed of the debris of plankton with silica shells, such as diatoms and radiolaria. This ooze is limited to areas with high biological productivity, such as the polar oceans, and upwelling zones near the equator. The least common type of sediment, it covers only 15% of the ocean floor. It accumulates at a slower rate than calcareous ooze: 0.2-1 cm / 1000 yr.
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