Distinguishing features:
Parent taxon (Markalius): Circular placoliths with moderately birefringent shields, bright inner tube cycle and narrow or closed central areas.
This taxon: Like M.inversus but with a row of perforations on the tube
Farinacci & Howe catalog pages:
M. neuquenensis *
| LITHS: placolith, circular, elliptical, CA: pores, closed, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent, |
| Lith size: 6->9µm; Data source notes: Guerra & Concheyro 2023 - and limits extended |
Geological Range:
Last occurrence (top): within NP1 zone (65.47-66.04Ma, top in Danian stage). Data source: Guerra & Concheyro 2023
First occurrence (base): within CC26 zone (66.04-67.82Ma, base in Maastrichtian stage). Data source: Guerra & Concheyro 2023
Plot of occurrence data:
Bown, P. R., Kim, H. & Gibbs, S. J. (2023). Danian calcareous nannofossil evolution and taxonomy with focus on sites from the North Atlantic Ocean (IODP Expedition 342, Sites U1403 and U1407). Journal of Nannoplankton Research. 41(2): 110-157. gs O Guerra, R. M. & Concheyro, A. (2023). A new Markalius species from the Cretaceous/Paleogene boundary of the Neuquén Basin (Argentina). Journal of Nannoplankton Research. 41(2): 106-109. gs References:

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Markalius neuquenensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-1-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1813 Go to Archive.is to create a permanent copy of this page - citation notes |
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