Nannotax3 - ntax_mesozoic - Anfractus youngii

Anfractus youngii


Classification: ntax_mesozoic -> Holococcoliths -> Rarer genera -> Anfractus -> Anfractus youngii
Sister taxa: A. harrisonii, A. parvus, A. variabilis, A. youngii, A. sp.

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: Holococcolith with broad, tall, tapering spine and diagonal internal septa.


Taxonomy:

Citation: Anfractus youngii Bown, 1993
Rank: Species

Farinacci & Howe catalog pages: A. youngii *

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: Holococcolith with broad, tall, tapering spine and diagonal internal septa.


Morphology:


Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: holococcolith, elliptical, hollow, CA: process, CROSS-POLARS: rim-unicyclic,
Lith size: 2->4µm;
Data source notes: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NJ8a subzone (171.79-174.59Ma, top in Aalenian stage). Data source: Bown & Cooper 1998
First occurrence (base): within NJ6 zone (180.49-181.63Ma, base in Toarcian stage). Data source: Bown & Cooper 1998

Plot of occurrence data:

References:

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O

Bown, P. R. (1993). New holococcoliths from the Toarcian-Aalenian (Jurassic) of northern Germany. Senckenbergiana Lethaea. 73: 407-419. gs


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Anfractus youngii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 27-11-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10022 Go to Archive.is to create a permanent copy of this page - citation notes



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