Micrantholithus disculus


Classification: ntax_cenozoic -> Braarudosphaerales -> Braarudosphaeraceae -> Micrantholithus -> Micrantholithus disculus
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.

Taxonomy:

Citation: Micrantholithus disculus (Bramlette & Riedel, 1954) Bown, 2005
Rank: Species
Basionym: Braarudosphaera discula Bramlette & Riedel, 1954
Synonyms: Citrocalculus minutus Troelsen & Quadros (1971) [specimens illustrated in side view by Bown 2005 clearly are the same as C. minutus - JRY April 2015]
Taxonomic discussion: Recombined as Micrantholithus discula by Bown 2005, the orthography was corrected to M. disculus by Bown 2016

Distinguishing features: Simple, elevated Micrantholithus with rounded outline and elliptical side views.

Farinacci & Howe catalog pages: B. discula * , C. minutus *

Search data:
TagsLITHS: nannolith-radiate, pentagonal, CROSS-POLARS: T-prominent,
MetricsLith size: 6->9µm; Segments: 5->5; Liths per sphere: 12->12
Data source notes: lith size (diameter) from OD & illustrated specimens; 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 Late Oligocene Sub-Epoch (23.03-28.09Ma, top in Chattian stage). Data source: Neptune records
First occurrence (base): within NP5 zone (59.54-61.51Ma, base in Selandian stage). Data source: [PRB rough estimate]

Plot of occurrence data:

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

Bramlette, M. N. & Riedel, W. R. (1954). Stratigraphic value of discoasters and some other microfossils related to Recent coccolithophores. Journal of Paleontology. 28: 385-403. gs

Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs

Okada, H. & Thierstein, H. R. (1979). Calcareous nannoplankton - Leg 43, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 43: 507-573. gs V O

Troelsen, J. & Quadros, L. P. (1971). Distribuição bioestratigráfica dos nanofósseis em sedimentos marinhos (Aptiano-Mioceno) do Brasil. Anais da Academia Brasileira de Ciencias. 43, 577-609: suplemento-. gs


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Micrantholithus disculus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=863 Go to Archive.is to create a permanent copy of this page - citation notes



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