Distinguishing features:
Parent taxon (placoliths inc sedis):
This taxon: Circular placoliths with moderately birefringent shields, a bright inner tube cycle and narrow or closed central areas.
Daughter taxa (time control age-window is: 0-800Ma) | ||||
Markalius inversus Markalius with closed central area. | ||||
Markalius neuquenensis Like M.inversus but with a row of perforations on the tube | ||||
Markalius vetulus Medium sized (6-7.5 µm), tube cycle very bright and individual elements not visible | ||||
Markalius sp. Specimens not identified to species level |
Taxonomy:
Farinacci & Howe catalog pages: Markalius + *
Distinguishing features:
Parent taxon (placoliths inc sedis):
This taxon: Circular placoliths with moderately birefringent shields, a bright inner tube cycle and narrow or closed central areas.
Morphology:
LITHS: placolith, circular, CA: closed, CROSS-POLARS: rim-unicyclic, V-prominent, |
Lith size: 6->9µm; Data source notes: size range of included species |
See also: Markalius - also occurs in the Palaeogene;
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 Early Valanginian Substage (135.70-137.70Ma, base in Valanginian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
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 Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs Varol, O. (2023). New Paleocene calcareous nannofossils: Carlamuelleria, Davidbukrya, Mauriceblackia, Noelia and Senelia. Marine Micropaleontology. 180: 1-41. gsReferences:
Mesozoic Nannoplankton compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-12-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10630 Go to Archive.is to create a permanent copy of this page - citation notes |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments (2)
hi,
There isn't the species "Markalius circumradiatus" here.
Hi, sorry for slow reply. The species is included in Haqius, so you can find it there. More generally you can use "search" to look for species and it in cases like these where the combination has changed it should send you in the right direction.