Nannotax3 - ntax_mesozoic - Prediscosphaera mgayae Nannotax3 - ntax_mesozoic - Prediscosphaera mgayae

Prediscosphaera mgayae


Classification: ntax_mesozoic -> Podorhabdales -> Prediscosphaeraceae -> Prediscosphaera -> P. spinosa group -> Prediscosphaera mgayae
Sister taxa: P. arkhangelskyi, P. borealensis, P. bukryi, P. incohatus, P. mgayae, P. rhombica, P. spinosa, P. stoveri

Distinguishing features:
Parent taxon (P. spinosa group): Elliptical Prediscophaera species with an axial cross
This taxon: Small (4-6 µm); inner-rim cycle narrow, axial cross delicate


Taxonomy:

Citation: Prediscosphaera mgayae Lees, 2007
Taxonomic rank: species

Farinacci & Howe catalog pages: P. mgayae *

Distinguishing features:
Parent taxon (P. spinosa group): Elliptical Prediscophaera species with an axial cross
This taxon: Small (4-6 µm); inner-rim cycle narrow, axial cross delicate


Morphology:

"A small, elliptical species of Prediscosphaera with a delicate axial cross and a very narrow, low-birefringence inner rim-cycle. Differentiation: P. spinosa has a thicker, bright inner rim-cycle and a subrectangular outline. P. stoveri is small, with a bright inner cycle that almost fills the central area. P. arkhangelskyi has a distinctive cross and thick, bright inner cycle. Other species of the genus have either circular outlines or crosses at 45 ̊ to the ellipse axes." [Lees 2007]

Size:
Holotype dimensions: L = 4.84μm, W = 3.08μm.

Search data:
LITHS: placolith, elliptical, CA: cross-axial, process, ca_disjunct, CROSS-POLARS: V-prominent, rim-bicyclic,
Lith size: 4->6µm; Segments: 16->16;
Data source notes: holotype +/- 1 µm
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Maastrichtian Substage (70.10-72.17Ma, top in Maastrichtian stage). Data source: Lees 2007 (original description)
First occurrence (base): in upper part of UC16 zone (80% up, 72.7Ma, in Campanian stage). Data source: Thibault 2010 - within UC16Dtp (p45)

Plot of occurrence data:

References:

Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs O

Perez-Rodriguez, I., Lees, J. A., Larasoaña, J. C., Arz, J. A. & Arenillas, I. (2012). Planktonic foraminiferal and calcareous nannofossil biostratigraphy and magnetostratigraphy of the uppermost Campanian and Maastrichtian at Zumaia, northern Spain. Cretaceous Research. 37: 100-126. gs

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs


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Prediscosphaera mgayae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-4-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10937 Go to Archive.is to create a permanent copy of this page - citation notes
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