Calcidiscus gallagheri


Ancestry: 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,

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


Taxonomy:

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

Farinacci & Howe catalog pages:

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


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

Geological Range:
Last occurrence (top): within NP25 zone (23.13-26.84Ma, top in Chattian stage). Data source: da Gama & Varol 2013
First occurrence (base): within NP25 zone (23.13-26.84Ma, base in Chattian stage). Data source: da Gama & Varol 2013

Plot of occurrence data:

References:

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


Nannotax3 - Coccolithophores - Calcidiscus gallagheri by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-3-2017

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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?
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Jeremy Young (UCL, UK)
thanks Dave that was typo of mine - I'll correct it!
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