Micrantholithus bulbosus


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

Taxonomy:

Citation: Micrantholithus bulbosus Bouché, 1962
Rank: Species
Variants: Micrantholithus ornatus Sullivan 1965- slightly more ornate but very similar.
Notes & discussion: Similar to Micrantholithus flos but with raised ridges around the sutures that widen at their ends, resembling discoaster bifurcations.
Also similar to Micrantholithus angulosus - but with simpler ray tips.

Distinguishing features: Micrantholithus with relatively straight edges and raised ridges around the sutures that widen at their ends.

Farinacci & Howe catalog pages: Micrantholithus bulbosus * , Micrantholithus ornatus *

Search data:
TagsLITHS: nannolith-radiate, star-shaped, RIM: tips-bifurcate, free-rays-short, PROCESS: distal-star,
CSPH: not known, T-UNITS: all,
MetricsLith size: 5->15µm; Segments: 5->5; Liths per sphere: 12->12
Sources: lith size (diameter) from ODs & illustrated specimens; lith numbers assumed from geometry
The morphological data given here can be used on the advanced search page. See also these notes

See also: Pemma basquense - similar morphotype in Pemma;

Geological Range:
Last occurrence (top): within NP15b subzone (44.12-45.49Ma, top in Lutetian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: [PRB rough estimate]

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Micrantholithus

    References:

    Bouché, P. M. (1962a). Nannofossiles calcaires de Lutétien du Bassin de Paris. Revue de Micropaléontologie. 5: 75-103. gs

    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

    Bybell, L. M. & Gartner, S. (1972). Provincialism among mid-Eocene calcareous nannofossils. Micropaleontology. 18(319-336): -. gs

    Stradner, H. & Papp, A. (1961). Tertiäre Discoasteriden aus Österreich und deren stratigraphische Bedeutung mit Hinweisen auf Mexico, Rumanien und Italien. Jahrbuch der Geologischen Bundesanstalt (Wien); Special Volume. 7: 1-159. gs

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

    Sullivan, F. R. (1965). Lower Tertiary nannoplankton from the California Coast Ranges. II. Eocene. University of California Publications in Geological Sciences. 53: 1-74. gs


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    Micrantholithus bulbosus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-10-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=861 Go to Archive.is to create a permanent copy of this page - citation notes



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