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Image of Valvulina triangularis d'Orbigny ex Guérin-Méneville 1832
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Valvulina triangularis d'Orbigny ex Guérin-Méneville 1832

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Valvulina triangularis is a species of foraminifers in the family Valvulinidae. This species is extinct. Dead Valvulina triangularis form calcareous oozes.

  • URI: http://eol.org/schema/terms/extinct
  • Definition: A taxon is Extinct when there is no reasonable doubt that the last individual has died. A \r\ntaxon is presumed Extinct when exhaustive surveys in known and/or expected habitat, \r\nat appropriate times (diurnal, seasonal, annual), throughout its historic range have failed \r\nto record an individual. Surveys should be over a time frame appropriate to the taxon’s \r\nlife cycle and life form.
  • Attribution: http://www.iucnredlist.org/technical-documents/categories-and-criteria
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  • URI: http://purl.obolibrary.org/obo/ENVO_02000046
  • Definition: Calcareous ooze is a marine sediment composed primarily of the shells--also known as tests--of foraminifera, coccolithophores, and pteropods. This is the most common pelagic sediment by area, covering 48% of the world ocean's floor. This type of ooze is limited to depths above the Carbonate Compensation Depth at time of burial. It accumulates more rapidly than any other pelagic sediment type, with a rate that varies from 0.3 - 5 cm / 1000 yr.
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EOL has data for 6 attributes, including:

Known occurrences, collected specimens and observations of Valvulina triangularis d'Orbigny ex Guérin-Méneville 1832. View this species on GBIF