Taxonomy:
Distinguishing features:
Parent taxon (Braarudosphaera): Pentaliths approximately pentagonal, sutures go to edges of pentagon.
This taxon: Braarudosphaera with 5-sided segments
Farinacci & Howe catalog pages: B. pentagonica *
Morphology:
LITHS: nannolith-radiate, pentagonal, CSPH: equant, monomorphic, CROSS-POLARS: T-prominent, |
Lith size: 7->10µm; Segments: 5->5; Coccosphere size: 14->20µm; Liths per sphere: 12->12 Data source notes: lith size (diameter) from OD and slightly extended; lith numbers assumed from geometry; csph size calculated from lith size |
Geological Range:
Notes: Described from sediments immediately above the K/Pg boundary in shelf sediments from the Netherlands, but way well obe found in older sediments if preservation is suitable
Last occurrence (top): within NP1 zone (65.47-66.04Ma, top in Danian stage). Data source: original description
First occurrence (base): within NP1 zone (65.47-66.04Ma, base in Danian stage). Data source: original description
Plot of occurrence data:
Mai, H. (2001). New coccolithophorid taxa fom the Guelhemmerberg airshaft. Lower Paleocene, The Netherlands. Micropaleontology. 47: 144-154. gs Mai, H., Willems, H. & von Salis Perch-Nielsen, K. (1997). Braarudosphaera pentagonica n.sp., a new Braarudosphaera from the lowermost Tertiary of Geulhemmerberg (Geulhem, The Netherlands). Micropaleontology. 43(2): 202-205. gs Mai, H., von Salis, K., Willems, H. & Romein, A. J. T. (1997). Fossil coccospheres from the K/T boundary section from Geulhemmerberg, The Netherlands. Micropaleontology. 43: 281-303. gsReferences:
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Braarudosphaera pentagonica 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=149 Go to Archive.is to create a permanent copy of this page - citation notes |
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