Nannotax3 - ntax_mesozoic - Nannoconus pseudoseptentrionalis

Nannotax3 - ntax_mesozoic - Nannoconus pseudoseptentrionalis <title>Nannotax3 - ntax_mesozoic - Nannoconus pseudoseptentrionalis

Nannoconus pseudoseptentrionalis

Classification: ntax_mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> Nannoconus - atypical -> Nannoconus pseudoseptentrionalis
Sister taxa: N. funiculus, N. ligius, N. magnadiscus, N. nicholasii, N. pseudoseptentrionalis, N. sabinae

Distinguishing features:
Parent taxon (Nannoconus - atypical): Atypical nannoconids, not fitting in any of the main groups
This taxon: Short nannoconid with narrow canal and ragged outline in plan view. Seen mainly in plan view.

Bown_etal_1998 EK 5-06-07.jpg
Jeremiah2001_pl2_fig1.JPG
Jeremiah2001_pl1_fig29.JPG
Jeremiah2001_pl1_fig30.JPG
Bown_etal_1998 EK 5-14-20.jpg

Taxonomy:

Citation: Nannoconus pseudoseptentrionalis Rutledge & Bown, 1996

Rank: Species

Farinacci & Howe catalog pages: N. pseudoseptentrionalis *

Morphology:

N. pseudoseptentrionalis is differentiated from other similar nannoconids by its irregular, ragged margin; this renders it similar to T. septentrionalis in XPL. These optically similar species are readily differentiated in PC (in which T. septentrionalis displays regularly-spaced wall elements), and in side view (T. septentrionalis is commonly encountered in highly distinctive side view). In end view, N. pseudoseptentrionalis lacks the weakly birefringent flanges often (but not always) seen on T. septentrionalis.

Size:

4.5-7µm in diameter.

Ecology & Biogeography

Biology & life-cycles

Phylogenetic relations

Search data:

LITHS: nannolith-radiate, circular, cylindrical, hollow, CA: vacant, CROSS-POLARS: T-prominent,

Lith size: 4.5->7µm;
Data source notes: original description

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Barremian Substage (129.41-130.77Ma, top in Barremian stage). Data source: Bown et al. 1998
First occurrence (base): within Early Barremian Substage (129.41-130.77Ma, base in Barremian stage). Data source: Bown et al. 1998

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
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Nannoconus - atypical

References:

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O

Jeremiah, J. (2001). A Lower Cretaceous nannofossil zonation for the North Sea Basin. Journal of Micropalaeontology. 20(1): 45-80. gs V O

Rutledge, D. & Bown, P. R. (1996). New names for old: taxonomic clarification of some Early Cretaceous nannofossil marker-species. Journal of Nannoplankton Research. 18(2): 53-59. gs V O

Nannoconus pseudoseptentrionalis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-1-2023

Taxon Search:

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AphiaID: not found
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10766 Go to Archive.is to create a permanent copy of this page - citation notes

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