Nannolith genera inc sed


Ancestry: Coccolithophores -> Nannolith families inc sed -> Nannolith genera inc sed
Sister taxa: Braarudosphaeraceae, Ceratolithaceae, Lapideacassaceae, Lithostromationaceae, Nannolith genera inc sed, Rhomboasteraceae,

Short diagnosis: Three apparently unique genera, not-included in described families


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
extant genera
Nannoliths are tetrads of spines - “caltrops”. Cells monomorphic, saddle-shaped, with long flagella and haptonema. 

Coccoliths formed of single angular calcite unti, coccospheres flower-like

Coccosphere formed of a few cap-shaped nannoliths

Nannoliths triradiate. Cells monomorphic.

fossil genera
Circular to stellate placoliths contructed from 6-12, large, radial elements. Often give the appearance of stellate nannoliths with low birefringence in LM.

Small to medium pentagonal liths, with narrow rim and granular central area plate. Dark image in LM.

Relatively tall nannoliths that flare from a small basal disc to form a trumpet shape. They have a narrow, axial canal and are usually seen in side view.

Nannoliths kite-shaped plates with raised margin on both sides

Typically large cruciform nannoliths with high curving ridges running from the centre to ray tips.

Taxonomy:

Citation: Nannolith genera incertae sedis
Rank: informal grouping

Farinacci & Howe catalog pages:

Short diagnosis: Three apparently unique genera, not-included in described families

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Coniacian Stage (86.26-89.77Ma, base in Coniacian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Nannotax3 - Coccolithophores - Nannolith genera inc sed by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-3-2017

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