P. columnata group

Classification: ntax_mesozoic -> Podorhabdales -> Prediscosphaeraceae -> Prediscosphaera -> P. columnata group
Sister taxa: P. columnata group, P. cretacea group, P. spinosa group, P. sp.

Distinguishing features: Circular Prediscophaera species

Daughter taxa (time control age-window is: 0-800Ma)
Prediscosphaera columnata
Circular to sub-circular, small; narrow inner-rim cycle
Prediscosphaera ponticula
Circular to sub-circular; medium-sized; broad rim; cross with secondary bars


Citation: Prediscosphaera columnata group
Rank: species group

Farinacci & Howe catalog pages: P. columnata group [no catalog entry yet]

Distinguishing features: Circular Prediscophaera species

Search data:
TagsLITHS: placolith, circular, CA: ca_disjunct,
MetricsLith size: 4->9┬Ám; Segments: 16->16;
Data source notes: size range of included species
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: This group is characteristic of the earlier part of the range of Prediscosphaera
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): at base of Albian Stage (0% up, 113Ma, in Albian stage). Data source: Total of range of species in this database

Plot of occurrence data:



P. columnata group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-5-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10845 Go to Archive.is to create a permanent copy of this page - citation notes

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