Micrantholithus tinus


Classification: ntax_cenozoic -> Braarudosphaerales -> Braarudosphaeraceae -> Micrantholithus -> Micrantholithus tinus
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 tinus Kapellos & Schaub 1973
Rank: Species
Taxonomic discussion: This species should be recombined in Braarudosphaera or Pentaster, since the sutures do not run along the rays. [my interpretation - JRY 2020]

Distinguishing features: Micrantholithus with bifurcate ray-like extension from each segment (sutures do not go along arms). Resembles a discoaster but evidently shows the birefringence of a pentalith and a specimen of M. concinnus with short rays is illustrated from the same sample so the identification seems well-founded.

Farinacci & Howe catalog pages: M. tinus *


Morphology: Some similarity to M. bramlettei but rays are much longer.

Search data:
TagsLITHS: nannolith-radiate, pentagonal, CROSS-POLARS: T-prominent,
MetricsLith size: 18->22µm; 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 NP13 zone (49.11-50.50Ma, top in Ypresian stage). Data source: Kapellos & Schaub 1973
First occurrence (base): within NP12 zone (50.50-53.70Ma, base in Ypresian stage). Data source: Kapellos & Schaub 1973

Plot of occurrence data:

References:

Kapellos, C. & Schaub, H. (1973). Zur Korrelation von Biozonierung mit Grossforaminiferen und Nannoplankton im Paläogen der Pyrenaen. Eclogae Geologicae Helvetiae. 66: 687-737. gs V O


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Micrantholithus tinus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-4-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=872 Go to Archive.is to create a permanent copy of this page - citation notes



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