Taxonomy:
Distinguishing features:
Parent taxon (R. lockeri group): Elliptical reticulofenestrids with relatively open central area spanned on the proximal surface by a robust grill (clearly visible in lm as a birefringent plate with variable number of perforations).
This taxon: Medium sized (5-6 µm) elliptical Reticulofenestra with slitting in distal shield and grill formed of robust bars.
Farinacci & Howe catalog pages: H. nicolasii *
Search data:
LITHS: placolith, elliptical, CA: ca_conjunct, grill, CSPH: monomorphic, CROSS-POLARS: R-prominent, |
Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: Perez Panera & Ronchi 2021
First occurrence (base): within NP13 zone (49.11-50.50Ma, base in Ypresian stage). Data source: Perez Panera & Ronchi 2021
Plot of occurrence data:
Pérez Panera, J. P. & Ronchi, D. I. (2021). Two new species of Hornibrookina Edwards, 1973 from the Austral Basin, Patagonia: Biostratigraphical and palaeoecological implications. Journal of Nannoplankton Research. 39(1): 3-13. gs O Young, J. R. (2023). Some proposed changes to the systematics of Cenozoic and Mesozoic nannoplankton. Journal of Nannoplankton Research. 41(1): 15-25. gs References:
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Reticulofenestra nicolasii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-2-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1687 Go to Archive.is to create a permanent copy of this page - citation notes |
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