Reticulofenestra magniscutum


Classification: ntax_cenozoic -> Isochrysidales -> Noelaerhabdaceae -> Reticulofenestra -> R. bisecta group -> Reticulofenestra magniscutum
Sister taxa: R. bisecta, R. filewiczii, R. stavensis, R. magniscutum ⟩⟨ R. perplexa, R. producta, D. sp.

Taxonomy:

Citation: Reticulofenestra magniscutum Bown & Newsam 2017
Rank: Species

Distinguishing features: Large, with thickened, dome-like distal shield; central area filled by a plug.

Farinacci & Howe catalog pages: R. magniscutum *


Morphology: Large, elliptical reticulofenestrids with a thickened, dome-like distal shield and central area filled with a plug.
Differentiation: Similar to other species of the Reticulofenestra bisecta group but with an elevated, dome-like distal shield, which is therefore highly birefringent (orange) in XPL and frequently seen in side view (Pl. 2, figs 41–44). [Bown & Newsam 2016]

Size: Holotype L = 8.5μm (Paratype L = 9.0μm). Side view coccolith height ~6.5μm.

Search data:
TagsLITHS: placolith, elliptical, CA: ca_conjunct, grill,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 8->12µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: We have observed this species from a short stratigraphic interval in the middle Eocene (Subzone NP15a-lower Zone NP16), in an interval that predates the common occurrence of other members of the Reticulofenestra bisecta group by around 6 m.y. The species is very rare and so tracing the relationship between R. magniscutum and R. bisecta has not been possible. [Bown & Newsam 2016]
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: Bown & Newsam 2016
First occurrence (base): within NP15a subzone (45.49-46.29Ma, base in Lutetian stage). Data source: Bown & Newsam 2016

Plot of occurrence data:

References:

Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs V O

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Reticulofenestra magniscutum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-1-2021

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