Nannotax3 - ntax_cenozoic - Neobiscutum Nannotax3 - ntax_cenozoic - Neobiscutum

Neobiscutum


Classification: ntax_cenozoic -> Isochrysidales -> Prinsiaceae -> Neobiscutum
Sister taxa: Futyania, Praeprinsius, Prinsius, Toweius ⟩⟨ Neobiscutum, Hornibrookina

Daughter taxa (time control age-window is: 0-800Ma)
Neobiscutum parvulum
Very small elliptical placoliths with narrow to closed central area.
Neobiscutum romeinii
Very small elliptical placoliths with open central area spanned by a net.
Neobiscutum sp.
Specimens which cannot be assigned to any established species

Taxonomy:

Citation: Neobiscutum Varol, 1989
taxonomic rank: Genus
Type species: Biscutum romeinii Perch-Nielsen, 1981

Distinguishing features:
Parent taxon (Prinsiaceae): Placoliths with R-units forming the lower layer of proximal shield, inner tube and middle tube; V-units forming an upper layer to the proximal shield, outermost tube and the distal shield. In LM they display a dark outer cycle and brighter inner cycle. Central-area structures are conjunct, formed from the R-units.
This taxon: Very small to small placoliths with closed or narrow central areas. Shields are dark in XPL with bright tube cycle.

Farinacci & Howe catalog pages: Neobiscutum *

Search data:
LITHS: placolith, elliptical, CA: ca_conjunct,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 2->3µm;
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 NP1 zone (100% up, 65.5Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within CC26 zone (66.04-67.82Ma, base in Maastrichtian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Varol, O. (1989c). Palaeocene calcareous nannofossil biostratigraphy. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series . 265-310. gs


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Neobiscutum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-7-2024

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=899 Go to Archive.is to create a permanent copy of this page - citation notes
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