Nannotax3 - ntax_cenozoic - Micrantholithus breviradiatus

Micrantholithus breviradiatus

Classification: ntax_cenozoic -> Braarudosphaerales -> Braarudosphaeraceae -> Micrantholithus -> Micrantholithus breviradiatus
Sister taxa: M. breviradiatus, M. disculus, M. flos ⟩⟨ M. astrum, M. entaster, M. excelsus, M. hebecuspis, M. minimus, M. pinguis, M. vesper ⟩⟨ M. attenuatus, M. mirabilis ⟩⟨ M. angulosus, M. bramlettei, M. bulbosus, M. crenulatus, M. tinus, M. sp.

Bown 2010 pl9-fig14.JPG
Bown-JNR2016-pl6-48.JPG
Bown_2005_JNR_pl35-fig10.jpg
Bown_2005_JNR_pl35-fig6.jpg
Bown_2005_JNR_pl35-fig7.jpg
Bown_2005_JNR_pl35-fig8.jpg
Bown_2005_JNR_pl35-fig9.jpg

Taxonomy:

Citation: Micrantholithus breviradiatus Bown, 2005

Rank: Species

Variants: Braarudosphaera undata Stradner 1959 is similar but has notched apices and only very shallowly indented sides.

Taxonomic discussion: Comparable to Micrantholithus obtusus Stradner, 1963 described from the Lower Cretaceous.

Distinguishing features:
Parent taxon (Micrantholithus): Pentaliths with sutures emerging through corners; edge often indented giving stellate outline
This taxon: Small to large Micrantholithus with shallowly indented sides and rounded apices.

Farinacci & Howe catalog pages: M. breviradiatus * , B. undata *

Search data:

Tags	LITHS: nannolith-radiate, pentagonal, star-shaped, CROSS-POLARS: T-prominent,
Metrics	Lith size: 3->9µm; Segments: 5->5; Liths per sphere: 12->12 Data source notes: lith size (diameter) from OD; lith numbers assumed from geometry

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP6 zone (58.97-59.54Ma, base in Selandian stage). Data source: [PRB rough estimate]

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Micrantholithus

References:

Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs V O

Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31(1): 11-38. gs V O

Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs V O

Stradner, H. (1959a). Die fossilen Discoasteriden Osterreichs. II. Erdoel-Zeitschrift. 75(12): 472-488. gs

Micrantholithus breviradiatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-9-2021

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=860 Go to Archive.is to create a permanent copy of this page - citation notes

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