Nannotax3 - ntax_mesozoic - Petrarhabdus kirenii Nannotax3 - ntax_mesozoic - Petrarhabdus kirenii

Petrarhabdus kirenii

Classification: ntax_mesozoic -> Podorhabdales -> Prediscosphaeraceae -> Petrarhabdus -> Petrarhabdus kirenii
Sister taxa: P. copulatus, P. kirenii, P. vietus, P. sp.


Citation: Petrarhabdus? kirenii Lees & Bown 2016
taxonomic rank: Species
Basionym: Petrarhabdus? kirenii Lees & Bown 2016
Taxonomic discussion: The assignment to Petrarhabdus is distinctly tentative.

Farinacci & Howe catalog pages: P. kirenii *


A very small to small, dark form comprising a single cycle of four radial, triangular/trapezoid elements of equal size. At the centre, there is usually a very small structure composed of four equidimensional crystallites. [Lees & Bown 2016]

Remarks: As yet, we have not seen this taxon in the SEM. This is a very distinctive form, but is possibly the spine-top of an as yet undescribed coccolith. We tentatively place this in Petrarhabdus until we have more information, because the spine-top in Petrarhabdus is similarly distinctive and composed of four subtriangular elements. However, Petrarhabdus is much larger and more robust-looking, with high yellow birefringence, and usually attached to a coccolith of equivalent or larger dimensions that is easily visible in the LM. [Lees & Bown 2016]

Holotype - L = 2.3μm, W = 2.3μm [Lees & Bown 2016]

Search data:
LITHS: nannolith-radiate, placolith, quadrate, CA: ca_disjunct, CROSS-POLARS: V-prominent,
Lith size: 2->3µm;
Data source notes: holotype +/- 0.5 µm
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.17Ma, top in Maastrichtian stage). Data source: Lees & Bown 2016
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian stage). Data source: Lees & Bown 2016

Plot of occurrence data:


Lees, J. A. & Bown, P. R. (2016). New and intriguing calcareous nannofossils from the Turonian (Upper Cretaceous) of Tanzania. Journal of Nannoplankton Research. 36(1): 83-95. gs

Püttmann, T., Mutterlose, J., Kaplan, U. & Scheer, U. (2019). Reworking of Cenomanian ammonites decoded by calcareous nannofossils (southern Münsterland Basin, northwest Germany). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291(1): 1-17. gs


Petrarhabdus kirenii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-2-2024

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