Nannotax3 - ntax_mesozoic - Braarudosphaera pseudobatilliformis

Braarudosphaera pseudobatilliformis


Classification: ntax_mesozoic -> Braarudosphaerales -> Braarudosphaeraceae -> Braarudosphaera -> Braarudosphaera pseudobatilliformis
Sister taxa: B. amputans, B. batilliformis, B. bigelowii, B. pseudobatilliformis, B. turbinea, B. wendlerae ⟩⟨ B. stenorhetha, B. africana, B. hockwoldensis, B. primula, B. regularis, B. quinquecostata, B. sp.

Distinguishing features:
Parent taxon (Braarudosphaera): Pentaliths with trapezoidal segments and sutures that go to edges of the pentagon.
This taxon: One segment asymetrically enlarged.


Taxonomy:

Citation: Braarudosphaera pseudobatilliformis Alves et al. 2017
Rank: Species

Farinacci & Howe catalog pages: B. pseudobatilliformis *

Distinguishing features:
Parent taxon (Braarudosphaera): Pentaliths with trapezoidal segments and sutures that go to edges of the pentagon.
This taxon: One segment asymetrically enlarged.


Morphology:

Braarudosphaera with four rounded to slightly angular, subtriangular to subrhomboidal segment and a fifth pointed, rhomboidal segment, the longest dimension of which is only slightly larger than that of the other segments. This rhomboidal segment gives an asymmetrical appearance to the outline.

Differentiation: Similar to B. batilliformis, but different due to the slightly elongated segment with an asymmetrical appearance to the outline, with a wide tip and diffuse edge, being less extended and lacking a central ridge (Pl. 2, fig. 15b).

Remarks: The larger segment in B. pseudobatilliformis is shorter than in B. batilliformis (Pl. 2, fig. 15). In XPL, the larger segment shows maximum birefringence when positioned at 45° relative to the plane of polarisation, but there is no ridge on the larger segment in B. pseudobatilliformis.
[from Alves et al. 2017]

Size:
Holotype maximum diameter (including the elongated segment) = 14μm; Holotype larger segment =7.5μm long.


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: nannolith-radiate, asymmetric, pentagonal, CA: closed,
CSPH: equant, monomorphic, CROSS-POLARS: T-prominent,
Lith size: 8->12µm; Segments: 5->5;
Data source notes: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Aptian Stage (112.95-126.30Ma, top in Aptian stage). Data source: Alves et al. 2017
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian stage). Data source: Alves et al. 2017

Plot of occurrence data:

References:

Alves, C. F., Lima, F. H. , de O. & Shimabukoro, S. (2017). New Aptian calcareous nannofossil species from Brazil. Journal of Nannoplankton Research. 37(1): 15-24. gs V O


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Braarudosphaera pseudobatilliformis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-11-2022

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10106 Go to Archive.is to create a permanent copy of this page - citation notes



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