Calcidiscus parvicrucis


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

Taxonomy:

Citation: Calcidiscus parvicrucis Bown, 2005
Rank: Species

Distinguishing features: Medium sized (5-6 µm) circular-subcircular placoliths with a non-birefringent distal shield, narrow bright tube cycle, and a narrow central area spanned by a small axial cross.

Farinacci & Howe catalog pages: Calcidiscus parvicrucis *

Search data:
TagsLITHS: placolith, elliptical, sub-circular, RIM: rim-broad, CA: cross, cross-axial,
CSPH: spherical, equant, monomorphic, V-UNITS: distal shield, tube, V-prominent, R-UNITS: c-str, prox shield, R-prominent, DETAILS: ca_disjunct, rim-bicyclic, isogyres oblique,
MetricsLith size: 5->6┬Ám;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP12 zone (50.50-53.70Ma, top in Ypresian stage). Data source: Shamrock & Watkins 2012
First occurrence (base): within NP9 zone (55.86-57.21Ma, base in Thanetian stage). Data source: Bown et al., 2007

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: C. pacificanus group

    References:

    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

    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

    Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. 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


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    Calcidiscus parvicrucis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=187 Go to Archive.is to create a permanent copy of this page - citation notes



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