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Nitzschia sigma is a species of diatoms in the family Bacillariaceae. They are native to Pernambuco, Rio Grande Do Sul, Rio Grande Do Norte, SãO Paulo, Santa Catarina, Pará, and Bahia. Dead Nitzschia sigma 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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EOL has data for 26 attributes, including:

Known occurrences, collected specimens and observations of Nitzschia sigma. View this species on GBIF