Bramletteius cultellus


Classification: ntax_cenozoic -> Coccolithales -> Coccolithaceae -> Bramletteius -> Bramletteius cultellus
Sister taxa: B. cultellus, B. serraculoides, B. sp.

Taxonomy:

Citation: Bramletteius cultellus Bown 2016
Rank: Species
Synonyms: Bramletteius sp. Okada & Thierstein (1979) [my interpretation - JRY 2017]

Distinguishing features:

Like B. serraculoides but spine narrower, and stratigraphically older

Farinacci & Howe catalog pages: B. cultellus *


Morphology: Placolith coccoliths with long, flat, narrow, blade-like spine.
Distinguished from Bramletteius serraculoides by its narrower spine. It is also considerably older than previously described species in this genus, which have middle Eocene to Oligocene stratigraphic ranges. This suggests that blade-like spines might not be particularly useful characters when defining genera and it is likely that Cruciplacolithus-like coccoliths may have produced such spines at various times during the Paleogene. The generic assignment is retained here until further stratigraphic information comes to light. [Bown 2016]

Size: Holotype length 5.4μm; spine height 7.4μm

Search data:
TagsLITHS: placolith, elliptical, CA: cross-axial, ca_disjunct, process, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 3->5µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP5 zone (59.54-61.51Ma, top in Selandian stage). Data source: Bown 2016
First occurrence (base): within NP4 zone (61.51-63.25Ma, base in Danian stage). Data source: Okada & Thierstein 1979

Plot of occurrence data:

References:

Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs V O

Okada, H. & Thierstein, H. R. (1979). Calcareous nannoplankton - Leg 43, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 43: 507-573. gs V O


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Bramletteius cultellus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=158 Go to Archive.is to create a permanent copy of this page - citation notes



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