Distinguishing features:
Parent taxon (R. bisecta group): Elliptical reticulofenestrids, central area closed by very robust, conspicuous distal ‘plug’ (birefringent).
This taxon: Large, with thickened, dome-like distal shield; central area filled by a plug.
| LITHS: placolith, elliptical, CA: ca_conjunct, grill, CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent, |
| Lith size: 8->12µm; |
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:
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Reticulofenestra magniscutum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-7-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1172 Go to Archive.is to create a permanent copy of this page - citation notes |
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