golden trilobite

Cenozoic and Modern Coccolithophores


Ancestry: Coccolithophores
Sister taxa:

Short diagnosis: Extant coccolithophores and Cenozoic calcareous nannofossils - Mesozoic nannofossil are in a separate module


Daughter taxa (blue => in age window 0-300Ma)Granddaughter taxa
Motile phases with vestigial haptonema. Heterococcoliths mostly placoliths with R-unit dominant

Mostly placolith heterococcoliths, with V-unit forming the distal shield; R-unit the proximal shield.

Heterococcoliths with V-units forming upper/outer cycle of imbricated elements and R-units forming basal plate and central mass of irregular elements

Coccoliths with radial lath cycle of T-units, and disjunct, often complex, axial structure, coccospheres often polymorphic

Various heterococcolith groups not obviously related to the well-defined orders

Haploid life-cycle stages, with liths formed of numerous rhombohedral microcrystals

Radially symmetrical nannoliths formed from one to several separate cycles of elements that radiate from a common centre or axis.

Haptophytes forming calcareous structures not obviously homologous with heterococcoliths, holococcoliths, or discoasteralids

Mesozoic taxa which occur in low abundances in the early Palaeogene.

Taxonomy:

Citation: Coccolithophores informal
Rank: overall group

Short diagnosis: Extant coccolithophores and Cenozoic calcareous nannofossils - Mesozoic nannofossil are in a separate module

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within Early Triassic Epoch (247.06-252.16Ma, base in Induan stage). Data source: [JRY rough estimate]

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 - Coccolithophores - Coccolithophores by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-7-2016

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