Sub-taxa & variants (time control age-window is: 0-800Ma) | ||||
Umbilicosphaera cf. U. henrikseniae Like C.? henrikseniae but circular. |
Taxonomy:
Distinguishing features:
Parent taxon (Umbilicosphaera): Central area open
This taxon: Medium sized (6-7 µm) elliptical placolith with a non-birefringent distal shield and vacant central area approximately the same width as the shields.
Farinacci & Howe catalog pages: C. henrikseniae *
Search data:
LITHS: placolith, elliptical, CA: vacant, CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Lith size: 6->7µm; |
Geological Range:
Last occurrence (top): within NP17 zone (37.32-40.40Ma, top in Priabonian stage). Data source: Shamrock & Watkins 2008
First occurrence (base): within NP15 zone (42.87-46.29Ma, base in Lutetian stage). Data source: Bown et al., 2007
Plot of occurrence data:
Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs O 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 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 Bown, P. R., Dunkley-Jones, T. & Young, J. R. (2007). Umbilicosphaera jordanii Bown 2005 from the Paleogene of Tanzania: confirmation of generic assignment and a Paleocene origination for the family Calcidiscaceae. Journal of Nannoplankton Research. 29(1): 25-30. gs Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gs Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. gs References:
Umbilicosphaera henrikseniae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-9-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1467 Go to Archive.is to create a permanent copy of this page - citation notes |
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