Anfractus 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.

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:

Ecology & Biogeography

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:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Anfractus

Anfractus variabilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-2-2023 Taxon Search: Advanced Search AphiaID: not found 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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