Nannotax3 - ntax_cenozoic - Markalius latus Nannotax3 - ntax_cenozoic - Markalius latus

Markalius latus

Classification: ntax_cenozoic -> Mesozoic Survivors -> Markalius -> Markalius latus
Sister taxa: M. apertus, M. inversus, M. latus, M. neuquenensis, M. walvisensis, M. sp.


Citation: Markalius latus Shamrock & Watkins (2012)
taxonomic rank: Species
Taxonomic discussion: Separated from M. inversus by Shamrock & Watkins (2012) on the basis of a morphometric study which showed clear bimodality in the population, also this form is confined to the Early Eocene

Distinguishing features:
Parent taxon (Markalius): Circular placoliths with moderately birefringent shields, bright inner tube cycle and narrow or closed central areas.
This taxon: Markalius species with wide, but closed, central area

Farinacci & Howe catalog pages: M. latus *

Diameter: 5.5-9µm; CA diameter: 2.3-3.8µm; CA/Shield ratio: 35-50 %; (Shamrock & Watkins 2012)

Search data:
LITHS: placolith, circular, CA: closed,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 5.5->9µm;
Data source notes: lith size from OD
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP14b subzone (46.29-47.84Ma, top in Lutetian stage). Data source: Shamrock & Watkins (2012)
First occurrence (base): within NP9 zone (55.86-57.21Ma, base in Thanetian stage). Data source: Shamrock & Watkins (2012)

Plot of occurrence data:


Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs O

Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs O

Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. gs

Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gs


Markalius latus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-7-2024

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