Calcidiscus gallagheri

Classification: ntax_cenozoic -> 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: C. gallagheri *

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

Search data:
TagsLITHS: placolith, elliptical, CA: grill, vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent,
MetricsLith size: 10->14µm;
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:


da Gama, R. O. B. P. & Varol, O. (2013). New Late Oligocene to Miocene Species. Journal of Nannoplankton Research. 33(1): 1-12. gs V O


Calcidiscus gallagheri compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-1-2021

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

Comments (1)

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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!
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