Reticulofenestra magniscutum


Classification: Coccolithophores -> 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: Reticulofenestra magniscutum *


Morphology remarks: 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, RIM: rim-broad, CA: grill,
CSPH: spherical, equant, monomorphic, V-UNITS: none, R-UNITS: all, c-str, distal shield, prox shield, tube, R-prominent, DETAILS: ca_conjunct, isogyres kinked, isogyres oblique, rim-unicyclic,
MetricsLith size: 8->12µm;
Sources:
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:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: R. bisecta group

    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 :: view :: open

    nannotaxlogo400px

    Reticulofenestra magniscutum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 7-6-2020

    Taxon Search:
    		Advanced Search

    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1172 Go to Archive.is to create a permanent copy of this page - citation notes
    Powered by Mikrotax taxonomy content management system developed by Jeremy Young


    Comments (0)

    No comments yet on this page. Please do add comments if you spot any problems, or have information to share

    Add Comment

    * Required information
    1000
    Captcha Image
    Powered by Commentics