 | This article's lead section may be too long. (October 2024) |
| Cibicidoides Temporal range: Pg - Present
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| Cibocidoides sp. | |
Scientific classification 
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| Domain: | Eukaryota |
| Clade: | Diaphoretickes |
| Clade: | SAR |
| Phylum: | Retaria |
| Subphylum: | Foraminifera |
| Class: | Globothalamea |
| Order: | Rotaliida |
| Family: | Cibicididae |
| Subfamily: | Cibicidinae |
| Genus: | Cibicidoides Thalmann, H. E., 1939.[1] |
| Species | |
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Many, including:
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Cibicidoides are an extant genus of benthic foraminifera, with the oldest known remains dating back to the Paleogene Period.[5] (66 mya - 23 mya)[6]
Like other benthic foraminifera, Cibicidoides are singled celled eucaryotic protists. They secrete a shell, or test, formed out of calcium carbonate (CaCO3), which provides a durable source of protection compared to other protists.[5]
Cibicidoides are structurally distinguished from other foraminifera by their segmented, spiral shaped tests. While Cibicidoides life span ranges from days to months depending on the species, all construct their segments in a clockwise order from the umbilical side (or counterclockwise order from the spinal side). This allows the age of an individual Cibicidoides to be determined based on the number segments present.[5]
Cibicidoides tests are generally transparent/translucent in color, allowing the color of the single celled organic matter to partially show from inside the test. The color of a test is also a primary indicator as to whether or not a Cibicidoides is considered dead or alive, as the organic matter will decay rapidly after death, leaving only the empty translucent test behind.[5]
- ^ Thalmann, Hans E. (1939). "Bibliography and Index to New Genera, Species, and Varieties of Foraminifera for the Year 1936". Journal of Paleontology. 13 (4): 425–465. JSTOR 1298535.
- ^ a b McCulloch, Irene Agnes (1977). Qualitative Observations on Recent Foraminiferal Tests with Emphasis on the Eastern Pacific. University of Southern California. OCLC 3311654.
- ^ Saidova, K. M. (1975). Бентосине фораминиферий Тихого океана-Bentosniye foraminifery Tikhogo Okeana-Benthonic Foraminifera of the Pacific Ocean. Институт океанологии им. П. П. Шершова Академии наук СССР-P.P. Shirshov Institute of Oceanology, Academy of Sciences of the USSR, Moscow. 3: parts.
- ^ Schwager, C. (1866). "Fossile Foraminiferen von Kar Nikobar". Reise der Österreichischen Fregatte Novara um die Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. Von Wüllerstorf-Urbair. Geologischer Theil (Zweite Abtheilung, Paläontologische Mittheilungen). 2 (2): 187–268.
- ^ a b c d "Foraminifera". British Geological Survey. 9 September 2021.
- ^ Cavin, Lionel (2017). "Assemblages of Freshwater Fishes in the Cenozoic". Freshwater Fishes: 250 Million Years of Evolutionary History. pp. 41–51. doi:10.1016/B978-1-78548-138-3.50003-0. ISBN 978-1-78548-138-3.