Nannotax3 - ntax_cenozoic - Markalius Nannotax3 - ntax_cenozoic - Markalius

Markalius


Classification: ntax_cenozoic -> Mesozoic Survivors -> Markalius
Sister taxa: Biscutaceae, Chiastozygaceae, Markalius, Watznaueriaceae

Daughter taxa (time control age-window is: 0-800Ma)
Markalius apertus
Markalius with open central area.
Markalius inversus
Markalius with closed central area.
Markalius latus
Markalius species with wide, but closed, central area
Markalius neuquenensis
Like M.inversus but with a row of perforations on the tube
Markalius walvisensis
Markalius with very narrow tube cycle and closed central area.
Markalius sp.
Specimens which cannot be assigned to any established species

Taxonomy:

Citation: Markalius Bramlette&Martini, 1964
Type species: Markalius inversus (Deflandre in Deflandre and Fert, 1954) Bramlette and Martini, 1964
Taxonomic discussion: As Varol (2023) has shown, both shields of Markalius are formed of V-units. This separates it from all other placoliths and justfies placing it as a genus incertae sedis.

Distinguishing features:
Parent taxon (Mesozoic Survivors): Mesozoic taxa which occur in low abundances in the early Palaeogene.
This taxon: Circular placoliths with moderately birefringent shields, bright inner tube cycle and narrow or closed central areas.

Farinacci & Howe catalog pages: Markalius + *


Size:
All described species are of similar size - coccoliths 5-10 µm across.

See also: Markalius - also occurs in the Mesozoic;

Search data:
Lith size: 5->10µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of NP21 zone (100% up, 32.9Ma, in Rupelian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within UC14 zone (80.97-82.79Ma, base in Campanian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Bown, P. R., Kim, H. & Gibbs, S. J. (2023). Danian calcareous nannofossil evolution and taxonomy with focus on sites from the North Atlantic Ocean (IODP Expedition 342, Sites U1403 and U1407). Journal of Nannoplankton Research. 41(2): 110-157. gs O

Bramlette, M. N. & Martini, E. (1964). The great change in calcareous nannoplankton fossils between the Maestrichtian and Danian. Micropaleontology. 10(2): 291-322. gs

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O

Varol, O. (2023). New Paleocene calcareous nannofossils: Carlamuelleria, Davidbukrya, Mauriceblackia, Noelia and Senelia. Marine Micropaleontology. 180: 1-41. gs


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Markalius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-5-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=838 Go to Archive.is to create a permanent copy of this page - citation notes
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