Citation: Micrantholithus breviradiatus Bown, 2005Rank: SpeciesVariants: 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.
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
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. gsVO
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. gsVO
Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gsVO
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