Nannotax3 - ntax_main - Calcidiscus scullyae Nannotax3 - ntax_main - Calcidiscus scullyae

Calcidiscus scullyae


Classification: ntax_main -> Coccolithales -> Calcidiscaceae -> Calcidiscus -> C. pacificanus group -> Calcidiscus scullyae
Sister taxa: C. bicircus, C. gerrardii, C. pacificanus, C. parvicrucis, C. parvus, C. scullyae, C. kamikurii


Taxonomy:
Citation: Calcidiscus scullyae Bown & Newsam 2017
Taxonomic rank: species

Distinguishing features:
Parent taxon (C. pacificanus group): Medium-sized Eocene calcidiscid coccoliths with narrow or closed central-area.
This taxon: Medium-sized, circular-subcircular; central-area narrow & spanned by low-birefringence crossbars

Farinacci & Howe catalog pages:
C. scullyae *


Morphology:
Medium-sized, circular-subcircular placoliths with a non-birefringent distal shield, a narrow, bright tube-cycle and narrow central-area spanned by low-birefringence crossbars.
Differentiation: Similar to C. bicircus but with narrow central area spanned by crossbars (see also Bown, 2005, Pl. 9, figs 21–22). Calcidiscus parvicrucis Bown, 2005 is elliptical, has a more distinct tube cycle and a younger range (Lower Eocene). [Bown & Newsam 2017]

Size:
Holotype L = 6.3μm (Paratype L = 6.0μm). [Bown & Newsam 2017]

Search data:
LITHS: placolith, circular, elliptical, CA: cross-axial, ca_disjunct,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 5->8µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP14b subzone (46.29-47.84Ma, top in Lutetian stage). Data source: Bown & Newsam 2017
First occurrence (base): within NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: Bown & Newsam 2017

Plot of occurrence data:

References:

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


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Calcidiscus scullyae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-4-2026

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=192 Go to Archive.is to create a permanent copy of this page - citation notes



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