Common genera


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

Distinguishing features: The four most commonly recorded genera


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Holococcoliths with a proximal plate of four blocks; ridged and pitted distal surface; and short, narrow, hollow spines. Entire coccolith bright in xpl in plan view

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. Rim bright and central plate dark

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: Common genera [no catalog entry yet]

Distinguishing features: The four most commonly recorded genera

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): in mid part of Valanginian Stage (54% up, 136.4Ma, in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:


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Common genera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-12-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10268 Go to Archive.is to create a permanent copy of this page - citation notes



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