Holococcoliths


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

Distinguishing features: Coccoliths formed of minute (ca 0.1µm) rhombohedral micro-crystals. Often a life-cycle stage with heterococcolith counterpart(s).


Daughter taxa: (blue => in age window 0-800Ma) 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: Holococcoliths [no catalog entry yet]

Distinguishing features: Coccoliths formed of minute (ca 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): 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 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. gs


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Holococcoliths compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-8-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10534 Go to Archive.is to create a permanent copy of this page - citation notes



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