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Nannotax3 - ntax_mesozoic - Munarinus mkeremei Nannotax3 - ntax_mesozoic - Munarinus mkeremei

Munarinus mkeremei


Classification: ntax_mesozoic -> Holococcoliths -> Rarer genera -> Munarinus -> Munarinus mkeremei
Sister taxa: M. keadyi, M. lesliae, M. marszalekii, M. mkeremei, M. sp.

Distinguishing features:
Parent taxon (Munarinus): Holococcoliths formed from 4-12 blocks with central-area filled or spanned by disjunct bar or block.
This taxon: central opening wide spanned by blunt-ended bar


Taxonomy:

Citation: Munarinus mkeremei Lees, 2007
Taxonomic rank: species

Farinacci & Howe catalog pages: M. mkeremei *

Distinguishing features:
Parent taxon (Munarinus): Holococcoliths formed from 4-12 blocks with central-area filled or spanned by disjunct bar or block.
This taxon: central opening wide spanned by blunt-ended bar


Morphology:

"A small species of Munarinus possessing a relatively wide central perforation that is spanned by a disjunct bar that joins the rim with straight edges and spans the short axis. At 0 ̊ in XPL, the extinction lines are aligned with the polarising directions, and on rotation these form v-shapes at the ends of the lith. The bar is not visible at 0 ̊, becoming bright on rotation. Differentiation: M. keadyi is smaller, with a narrower central perforation and with a short-axis bar that is subrhombic. The pointed ends of that bar slot into the rim." [Lees 2007]

Size:
Holotype dimensions: L = 4.84μm, W = 3.52μm.

Search data:
LITHS: holococcolith, elliptical, CA: bar, pores, ca_disjunct, CROSS-POLARS: rim-unicyclic,
Lith size: 4->6µm;
Data source notes: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Campanian Stage (72.17-83.65Ma, top in Campanian stage). Data source: Lees 2007 (original description)
First occurrence (base): within Campanian Stage (72.17-83.65Ma, base in Campanian stage). Data source: Lees 2007 (original description)

Plot of occurrence data:

References:

Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs O


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Munarinus mkeremei compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-3-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10707 Go to Archive.is to create a permanent copy of this page - citation notes
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