Nannotax3 - ntax_cenozoic - Micrantholithus disculus

Citation: Micrantholithus disculus (Bramlette & Riedel, 1954) Bown, 2005

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.

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]

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

Tags	LITHS: nannolith-radiate, pentagonal, CROSS-POLARS: T-prominent,
Metrics	Lith 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

Micrantholithus disculus

References:

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