Pedinocyclus gibbsiae

Classification: ntax_cenozoic -> Coccolith families inc sed -> Coccolith genera inc sed -> Pedinocyclus -> Pedinocyclus gibbsiae
Sister taxa: P. gibbsiae, P. larvalis, G. okayi, P. sp.


Citation: Pedinocyclus gibbsiae Bown & Dunkley Jones, 2012
Rank: Species
Taxonomic discussion: Distinguished from Pedinocyclus larvalis by the relatively narrower rim and wider central area, and from the early Eocene Geminilithella okayi Varol, 1989 by the broader inner tube cycle.

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: 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: Holotype length 8.3 microns

Search data:
TagsLITHS: planolith, circular, CA: vacant, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 6->10µm;
Data source notes: lith length from OD
The morphological data given here can be used on the advanced search page. See also these notes

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 V 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


Pedinocyclus gibbsiae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2021

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