Holococcoliths


Ancestry: Mesozoic -> Holococcoliths
Sister taxa: Arkhangelskiales, Eiffellithales, Stephanolithiales, Podorhabdales, Watznaueriales, Nannoliths, Holococcoliths, Heterococcoliths inc sedis, Mesozoic non–coccoliths, hidden,

Short diagnosis: Coccoliths formed of minute (c.0.1µm) rhombohedral micro crystals. Often a life-cycle stage with heterococcolith counterpart(s).


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
The four most commonly recorded genera

Less common genera

Taxonomy:

Citation: Holococcoliths
Rank: informal group
Notes & 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

Farinacci & Howe catalog pages:

Short diagnosis: Coccoliths formed of minute (c.0.1µm) rhombohedral micro crystals. Often a life-cycle stage with heterococcolith counterpart(s).


Ecology & Biogeography: Holococcoliths can occur in any environments at the present day but high abundance and diversity of holococcoliths is considered typical of oligotrophic environments.

Geological Range:
Last occurrence (top): within Thanetian Stage (55.96-59.24Ma, top in Thanetian stage). Data source: Total of range of species in this database
First occurrence (base): within Toarcian Stage (174.15-182.70Ma, base in Toarcian stage). Data source: Total of range of species in this database

Plot of occurrence data:

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, Special Issue, 1: 1-132.


Nannotax3 - Mesozoic - Holococcoliths by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-3-2017

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