Distinguishing features: Parent taxon (ntax_mesozoic): Mesozoic nannofossils - Cenozoic and extant taxa are in a separate module This taxon: Coccoliths formed of minute (ca 0.1µm) rhombohedral micro-crystals. Often a life-cycle stage with heterococcolith counterpart(s).
Daughter taxa (time control age-window is: 0-800Ma)
Granddaughter taxa
Common genera The four most commonly recorded genera
Citation: HolococcolithsRank: Informal group of familiesTaxonomic discussion: Holococcoliths traditonally were all placed in a family the Calyptrosphaeraceae. However, study of modern coccolthophres has shown that holococcoliths are formed during the haploid life cycle stage of coccolithophres and so they are not a phylogenetic group (Young et al. 2003).
The subdivision here into common and rarer genera ismade purelyto highlight those genera which are worth paying attention to first
Distinguishing features: Parent taxon (ntax_mesozoic): Mesozoic nannofossils - Cenozoic and extant taxa are in a separate module This taxon: Coccoliths formed of minute (ca 0.1µm) rhombohedral micro-crystals. Often a life-cycle stage with heterococcolith counterpart(s).
Ecology & BiogeographyHolococcoliths can occur in any environments at the present day but high abundance and diversity of holococcoliths is considered typical of oligotrophic environments.
Search data:
: holococcolith,
Lith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range: Last occurrence (top): at top of Thanetian Stage (100% up, 56Ma, in Thanetian stage). Data source: Total of range of species in this database First occurrence (base): at base of Toarcian Stage (0% up, 182.7Ma, in Pliensbachian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: ntax_mesozoic
References:
Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research. S1: 1-132. gsVO
Holococcoliths compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-4-2023
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