Nannotax3 - ntax_cenozoic - Blackites deflandrei 2 Nannotax3 - ntax_cenozoic - Blackites deflandrei 2

Blackites deflandrei 2


Classification: ntax_cenozoic -> Syracosphaerales -> Rhabdosphaeraceae -> Blackites -> B. morionum group -> Blackites deflandrei -> Blackites deflandrei 2
Sister taxa: B. deflandrei 1, B. deflandrei 2

Taxonomy:

Citation: Blackites deflandrei var. 2 Bown & Newsam 2017
Taxonomic rank: type
Taxonomic discussion: Ths form is similar to Amitha prolata [JRY 2017]

Distinguishing features:
Parent taxon (Blackites deflandrei): Spine relatively low, wide, hollow sacculiform; constructed from at least two distinct structural units when viewed in XPL; there may be a small, terminal papilla.
Typically the height and width are similar but the height can be greater. The spine is always slightly narrower than the base.

This taxon: spine height > coccolith rim width

Farinacci & Howe catalog pages:


Morphology:

Like B. deflandrei var. 1 but with with spine height>coccolith rim width.

Search data:
LITHS: planolith, elliptical, circular, CA: ca_disjunct, grill, process,
Lith size: 5->8µm;
Data source notes: lith size (spine height) from 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 NP19-20 zone (34.44-36.97Ma, top in Priabonian stage). Data source: Bown & Newsam 2017
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Bown & Newsam 2017

Plot of occurrence data:

References:

Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs O


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Blackites deflandrei 2 compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-2-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=99 Go to Archive.is to create a permanent copy of this page - citation notes
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