Editing Coccolithophore (section)

==Evolution and diversity==
Coccolithophores are members of the clade [[Haptophyta]], which is a sister clade to [[Centrohelida]], which are both in [[Haptista]].<ref name="Taylor-et-al-2017">{{cite journal | last1=Taylor | first1=Alison R. | last2=Brownlee | first2=Colin | last3=Wheeler | first3=Glen | title=Coccolithophore Cell Biology: Chalking Up Progress | journal=[[Annual Review of Marine Science]] | publisher=[[Annual Reviews (publisher)|Annual Reviews]] | volume=9 | issue=1 | date=2017-01-03 | issn=1941-1405 | doi=10.1146/annurev-marine-122414-034032 | pages=283–310| pmid=27814031 | bibcode=2017ARMS....9..283T | url=http://plymsea.ac.uk/id/eprint/9134/1/Taylor%20et%20al%20Ann%20Rev%20Mar%20Sci%202017.pdf |archive-url=https://web.archive.org/web/20210716073801/http://plymsea.ac.uk/id/eprint/9134/1/Taylor%20et%20al%20Ann%20Rev%20Mar%20Sci%202017.pdf |archive-date=2021-07-16 |url-status=live }}</ref> The oldest known coccolithophores are known from the Late Triassic, around the [[Norian]]-[[Rhaetian]] boundary.<ref>{{Cite journal|last1=Gardin|first1=Silvia|last2=Krystyn|first2=Leopold|last3=Richoz|first3=Sylvain|last4=Bartolini|first4=Annachiara|last5=Galbrun|first5=Bruno|date=October 2012|title=Where and when the earliest coccolithophores?: Where and when the earliest coccolithophores?|url=https://onlinelibrary.wiley.com/doi/10.1111/j.1502-3931.2012.00311.x|journal=Lethaia|language=en|volume=45|issue=4|pages=507–523|doi=10.1111/j.1502-3931.2012.00311.x}}</ref> Diversity steadily increased over the course of the Mesozoic, reaching its apex during the [[Late Cretaceous]]. However, there was a sharp drop during the [[Cretaceous-Paleogene extinction event]], when more than 90% of coccolithophore species became extinct. Coccoliths reached another, lower apex of diversity during the [[Paleocene–Eocene Thermal Maximum|Paleocene-Eocene thermal maximum]], but have subsequently declined since the [[Oligocene]] due to decreasing global temperatures, with species that produced large and heavily calcified coccoliths most heavily affected.<ref name="Monteiro2016" />
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| image1            = Evolutionary history of coccolithophores.jpg
| caption1          = Evolutionary history of coccolithophores:<ref name="Monteiro2016" /> (A) Coccolithophore species richness over time; (B) The fossil record of major coccolithophore [[biomineralization]] innovations and morphogroups.
| image2            = Diversity of coccolithophores.jpg
| caption2          = Coccolithophore diversity. ''[[Emiliania huxleyi]]'' (E), the reference species for coccolithophore studies, is contrasted with a range of other species spanning the biodiversity of modern coccolithophores. All images are scanning electron micrographs of cells collected by seawater filtration from the open ocean. Species illustrated: (A) ''[[Coccolithus]] pelagicus'', (B) ''Calcidiscus leptoporus'', (C) ''[[Braarudosphaera bigelowii]]'', (D) ''[[Gephyrocapsa oceanica]]'', (E) ''[[Emiliania huxleyi]]'', (F) ''[[Discosphaera tubifera]]'', (G) ''[[Rhabdosphaera clavigera]]'', (H) ''Calciosolenia murrayi'', (I) ''Umbellosphaera irregularis'', (J) ''Gladiolithus flabellatus'', (K and L) ''Florisphaera profunda'', (M) ''[[Syracosphaera]] pulchra'', and (N) ''Helicosphaera carteri''. Scale bar is 5 μm.
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