Youngilithus pyxis

Classification: ntax_cenozoic -> Holococcoliths -> fossil holococcoliths -> Youngilithus -> Youngilithus pyxis
Sister taxa: Y. arcaeformis, Y. bipons, Y. oblongatus, Y. pyxis, Y. quadraeformis, Y. transversipons, Y. sp.


Citation: Youngilithus pyxis Bown & Dunkley Jones, 2006
Rank: Species
Taxonomic discussion: Squarer shape than Youngilithus oblongatus and lacks the cross-bars seen in Youngilithus quadraeformis.

Distinguishing features: A rectangular to square, box-like holococcolith constructed from four crystallographically distinct units, with at least two protrusions on each side.

Farinacci & Howe catalog pages: Y. pyxis *

Search data:
TagsLITHS: holococcolith, quadrate, CA: vacant, CROSS-POLARS: V-prominent,
MetricsLith size: 4->5.5µm;
Data source notes: lith size from OD
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: Bown & Dunkley Jones, 2006
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Bown & Dunkley Jones, 2006

Plot of occurrence data:


Bown, P. R. & Dunkley Jones, T. (2006). New Paleogene calcareous nannofossil taxa from coastal Tanzania: Tanzania Drilling Project Sites 11 to 14. Journal of Nannoplankton Research. 28(1): 17-34. gs V O


Youngilithus pyxis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2021

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
Captcha Image
Powered by Commentics