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Nannotax3 - ntax_cenozoic - Blackites culter Nannotax3 - ntax_cenozoic - Blackites culter

Blackites culter


Classification: ntax_cenozoic -> Syracosphaerales -> Rhabdosphaeraceae -> Blackites -> B. inflatus group -> Blackites culter
Sister taxa: B. aktulagayensis, B. bullatus, B. creber, B. culter, B. flammeus, B. fustis, B. gladius, B. globosus, B. herculesii, B. inflatus, B. kilwaensis, B. ornatus, B. piriformis, B. praeinflatus, B. pseudomorionum, B. rotundus, B. rugosus, B. sextonii, B. turritus, B. virgatus

Taxonomy:

Citation: Blackites culter Dunkley Jones et al., 2009
Taxonomic rank: species

Distinguishing features:
Parent taxon (B. inflatus group): Spine inflated with maximum width above base, many with conspicous bulge
This taxon: Rhabdolith with a tall spine that has concave depressions running along its length, producing either a three (Y-shaped), or possibly four-fold (X-shaped), symmetry across the axis of the spine.

Farinacci & Howe catalog pages: B. culter *


Morphology:

In LM the spine is moderately dark in XPL and has a flat blade-like appearance. The spine broadens away from the coccolith to a maximum width approximately two-thirds of the way up the spine and then tapers to a point with an overall height approximately four times the width of the coccolith. Maximum spine-width is slightly less than the width of the basal coccolith.

Search data:
LITHS: planolith, elliptical, CA: ca_disjunct, grill, process,
Lith size: 6->12µm;
Data source notes: lith size (spine height) from OD & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: Dunkley Jones et al., 2009
First occurrence (base): within NP19-20 zone (34.44-36.97Ma, base in Priabonian stage). Data source: Dunkley Jones et al., 2009

Plot of occurrence data:

References:

Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs

Jones, A. P. & Dunkley Jones, T. (2020). Middle Eocene to Early Oligocene calcareous nannofossils from the Nanggulan Formation, Java, Indonesia. Journal of Nannoplankton Research. 38(1): 57-79. gs

Müller, C. (1979). Calcareous nannofssils from the North Atlantic (Leg 48). Initial Reports of the Deep Sea Drilling Project. 48: 589-639. gs


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Blackites culter compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-3-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=96 Go to Archive.is to create a permanent copy of this page - citation notes
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