Calcidiscus gallagheri

Classification: Coccolithophores -> Coccolithales -> Calcidiscaceae -> Calcidiscus -> C. leptoporus group -> Calcidiscus gallagheri
Sister taxa: C. gallagheri, C. leptoporus, C. macintyrei, C. pataecus, C. premacintyrei, C. salomonii, C. tropicus,


Citation: Calcidiscus gallagheri da Gama & Varol 2013
Rank: Species

Distinguishing features: Larger weakly elliptical Calcidiscus species with clearly elliptical central area, opening spanned by a perforated plate.

Original description: Diagnosis: Elliptical species of Calcidiscus with large central area covered by a finely porous plate. Description: This elliptical Calcidiscus has a relatively large central area covered by a finely porous plate. The distal shield and porous plate are non-birefringent where- as the proximal shield is smaller and weakly birefringent under polarised light. No tube cycle was noted. In some specimens, the central porous plate displays a longitudi- nal suture. However, this suture might be the result of poor preservation.

Farinacci & Howe catalog pages: Calcidiscus gallagheri *

Morphology remarks: Simlar to C. premacintyrei but with plate in central opening, and earlier occurrence

Search data:
TagsLITHS: placolith, elliptical, sub-circular, RIM: rim-broad, CA: grill, vacant,
CSPH: spherical, equant, monomorphic, V-UNITS: distal shield, tube, V-prominent, R-UNITS: prox shield, R-prominent, DETAILS: isogyres oblique, rim-unicyclic,
MetricsLith size: 10->14┬Ám;
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: da Gama & Varol 2013
First occurrence (base): within NP25 zone (24.40-26.84Ma, base in Chattian stage). Data source: da Gama & Varol 2013

Plot of occurrence data:

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


    da Gama, R. O. B. P. & Varol, O. (2012). New Late Oligocene to Miocene Species. Journal of Nannoplankton Research. 33(1): 1-12. gs


    Calcidiscus gallagheri compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-3-2020

    Taxon Search:
    Advanced Search

    Short stable page link: Go to to create a permanent copy of this page - citation notes

    Comments (1)

    Sort By
    Page 1 of 1
    David Bord (ALS, US)
    I notice you put the first occurrence at NP5, but da Gama & Varol 2013 restrict this species to NP25. Is this a mistake or have you heard differently?
    Jeremy Young (UCL, UK)
    thanks Dave that was typo of mine - I'll correct it!
    Page 1 of 1

    Add Comment

    * Required information
    Captcha Image
    Powered by Commentics