Common genera


Ancestry: Mesozoic -> Holococcoliths -> Common genera
Sister taxa: Common genera, Rarer genera,

Short diagnosis: The four most commonly recorded genera


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Holococcoliths with a proximal plate of four blocks; ridged and pitted distal surface; and short, narrow, hollow spines.

Holococcoliths with a proximal plate of four blocks and tall, hollow spines, which are often ridged or pitted and may be bulbous or curved.

Holococcoliths with narrow rim surrounding a central-area formed of 2-4 blocks. Typically non-cavate with no spine.

Holococcoliths with a narrow rim and a central structure comprising two or four blocks which typically incorporate a distal bridge-shaped structure which may extend into a spine; the blocks may be perforate.

Taxonomy:

Rank: informal group

Farinacci & Howe catalog pages:

Short diagnosis: The four most commonly recorded genera

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Valanginian Stage (133.88-139.39Ma, base in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Nannotax3 - Mesozoic - Common genera by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-5-2017

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