Distinguishing features:
Parent taxon (Anfractus): Elliptical, cavate (and usually septate) holococcoliths, often bearing hollow spines. Distal surfaces may be perforate and there may be internal buttresses.
This taxon: Very small holococcolith with distal surface pierced by 8-10 pores.
Taxonomy:
Farinacci & Howe catalog pages: A. variabilis *
Distinguishing features:
Parent taxon (Anfractus): Elliptical, cavate (and usually septate) holococcoliths, often bearing hollow spines. Distal surfaces may be perforate and there may be internal buttresses.
This taxon: Very small holococcolith with distal surface pierced by 8-10 pores.
Morphology:
Size:
Ecology & Biogeography
Biology & life-cycles
Phylogenetic relations
: |
Lith size: 0->0µm; |
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:
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Anfractus variabilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-2-2023
Short stable page link: https://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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