Taxonomy:
NB The diagnosis states that "The rim width is just less than half that of the central area (rim width/central area width: ~0.4)" but there is clearly a mistake here, since the rim width of the holotype is slightly more than that of the central area.
Distinguishing features:
Parent taxon (Pedinocyclus): Typically circular planolith coccoliths with broad, flat shield and rim elements joined along inclined sutures. Shield is dark in XPL but a narrow, brighter tube cycle may be present.
This taxon: Medium to large, circular coccoliths with broad rim, narrow, bright inner tube cycle (in XPL) and open central-area. Rim elements are strongly inclined.
Farinacci & Howe catalog pages: P. gibbsiae *
Size:
LITHS: planolith, circular, CA: vacant, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Lith size: 6->10µm; Data source notes: lith length from OD |
Geological Range:
Last occurrence (top): within NP25 zone (24.40-26.84Ma, top in Chattian stage). Data source: Bown & Dunkley Jones, 2012
First occurrence (base): within NP21 zone (32.92-34.44Ma, base in Priabonian stage). Data source: Bown & Dunkley Jones, 2012
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 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:
Pedinocyclus gibbsiae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-10-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1031 Go to Archive.is to create a permanent copy of this page - citation notes |
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