Nannotax3 - ntax_cenozoic - Youngilithus bipons Nannotax3 - ntax_cenozoic - Youngilithus bipons

Youngilithus bipons

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


Citation: Youngilithus bipons Bown 2016
taxonomic rank: Species

Distinguishing features:
Parent taxon (Youngilithus): Geometrically shaped non-birefringent holococcoliths typically possessing lateral rim spines and central area bars.
This taxon: Rhomboid liths with small, marginal projections from the rim and two oblique, parallel, central area bars. Low birefringence image in XPL.

Farinacci & Howe catalog pages: Y. bipons *

Holotype 6.2 µm

Search data:
LITHS: holococcolith, quadrate, CA: bar, CROSS-POLARS: V-prominent,
Lith size: 5->6.5µm; Segments: 6->6;
Data source notes: lith size from OD & extended slightly
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP5 zone (59.54-61.51Ma, top in Selandian stage). Data source: Bown 2016
First occurrence (base): within NP5 zone (59.54-61.51Ma, base in Selandian stage). Data source: Bown 2016

Plot of occurrence data:


Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs O


Youngilithus bipons compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-5-2024

Taxon Search:
Advanced Search

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

Nannotax is being sponsored through 2024 by Woodside Energy and Shell USA

Add Comment

* Required information
Captcha Image
Powered by Commentics


No comments yet. Be the first!