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.

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

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]

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: 1-7-2016

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