Anfractus variabilis


Classification: Mesozoic -> hidden -> deleted -> Anfractus variabilis
Sister taxa: A. variabilis, A. confusa, A. paucipunctata, C. noeliae subsp. depressa, C. noeliae subsp. noeliae, C. noeliae subsp. recondita, Centosphaera, C. barbata, C. ocellatus, C. prinsii, C. deflandrei (morphotype A), C. deflandrei (morphotype B), C. asymmetricus, H. geometricus, M. bramlettei, N. erbae> >>

Distinguishing features: Very small holococcolith with distal surface pierced by 8-10 pores.


Taxonomy:

Citation: Anfractus variabilis Medd, 1979
Rank: Species
Taxonomic discussion: Lambert (1987) documented great varibility in A. harrisonii and suggested A. variabilis should be considered a synonym/conspecific variant of it.

Farinacci & Howe catalog pages: A. variabilis *

Distinguishing features: Very small holococcolith with distal surface pierced by 8-10 pores.


Size: Type length 1.8 microns.

Search data:
TagsLITHS:
MetricsLith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Callovian Stage (163.47-166.07Ma, top in Callovian stage). Data source: Medd, 1979
First occurrence (base): within Callovian Stage (163.47-166.07Ma, base in Callovian stage). Data source: Medd, 1979

Plot of occurrence data:

References:

Medd, A. W. (1979). The Upper Jurassic coccoliths from the Haddenham and Gamlingay boreholes (Cambridgeshire, England). Eclogae Geologicae Helvetiae. 72: 19-109. gs V O


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Anfractus variabilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-10-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10021 Go to Archive.is to create a permanent copy of this page - citation notes



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