Nannotax3 - Coccolithophores - Calcidiscus gallagheri

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,

daGama_and_Varol2013-pl2-fig03.JPG
daGama_and_Varol2013-pl2-fig05.JPG

Taxonomy:

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:

Tags	LITHS: 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,
Metrics	Lith size: 10->14µm; Sources:

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

References:

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: 26-2-2020

Taxon Search:

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=176 Go to Archive.is 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?

15th April 2015 3:34pm