Taxonomy:
Distinguishing features:
Parent taxon (Braarudosphaera): Pentaliths approximately pentagonal, sutures go to edges of pentagon.
This taxon: Elevated pentaliths that taper sharply from the base.
Farinacci & Howe catalog pages: B. stylifera * , B. orthia + *
Size:
LITHS: nannolith-radiate, pentagonal, CROSS-POLARS: T-prominent, |
Lith size: 6->15µm; Segments: 5->5; Coccosphere size: 12->30µm; Liths per sphere: 12->12 Data source notes: lith size (diameter) from OD & illustrred specimens of Bown 2005; lith numbers assumed from geometry; csph size calculated from lith size |
Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP17 zone (37.32-40.40Ma, base in Bartonian stage). Data source: [PRB rough estimate]
Plot of occurrence data:
Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs O Bybell, L. M. & Gartner, S. (1972). Provincialism among mid-Eocene calcareous nannofossils. Micropaleontology. 18(319-336): -. gs Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs O Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs Lambert, B. (1987). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional. Cahiers de Micropaléontologie. 2(2): 33-60. gs O Steurbaut, E. & Nolf, D. (2021). The Mont-des-Récollets section (N France): a key site for the Ypresian-Lutetian transition at mid-latitudes – reassessment of the boundary criterion for the base-Lutetian GSSP. Geodiversitas. 43(11): 311-363. gs Troelsen, J. & Quadros, L. P. (1971). Distribuição bioestratigráfica dos nanofósseis em sedimentos marinhos (Aptiano-Mioceno) do Brasil. Anais da Academia Brasileira de Ciencias. 43, 577-609: suplemento-. gsReferences:
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Braarudosphaera stylifera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-5-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=154 Go to Archive.is to create a permanent copy of this page - citation notes |
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