Taxonomy:
NB Orthogrpahy emeneded from R. gracilentus to R. gracilenta by Bown & Newsam 2017
Distinguishing features:
Parent taxon (Rhabdosphaera): Coccoliths without radial lath cycle; coccospheres dimorphic, only some spine-bearing
This taxon: Rhabdoliths with a thin, narrow coccolith base and a narrow spine with an axial canal.
Farinacci & Howe catalog pages: B. gracilentus *
Search data:
LITHS: planolith, elliptical, CA: ca_disjunct, process, CROSS-POLARS: R-prominent, |
Lith size: 6->10µm; Data source notes: lith length from OD |
Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: Dunkley Jones et al., 2009
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Bown & Dunkley Jones, 2006
Plot of occurrence data:
Bown, P. R. & Dunkley Jones, T. (2006). New Paleogene calcareous nannofossil taxa from coastal Tanzania: Tanzania Drilling Project Sites 11 to 14. Journal of Nannoplankton Research. 28(1): 17-34. gs Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. 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. gsReferences:
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Rhabdosphaera gracilenta compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-2-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1196 Go to Archive.is to create a permanent copy of this page - citation notes |
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