Nannotax3 - ntax_cenozoic

Nannotax3 - ntax_cenozoic - Neobiscutum

Neobiscutum

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

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 *

Morphology:

Size:

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): near base of Danian Stage (13% up, 65.5Ma, in Danian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Danian Stage (0% up, 66Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Prinsiaceae

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 V O

Neobiscutum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-9-2022

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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