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Nannotax3 - ntax_cenozoic - Blackites cf. B. dupuisii Nannotax3 - ntax_cenozoic - Blackites cf. B. dupuisii

Blackites cf. B. dupuisii

Variant: Blackites cf. B. dupuisii is regarded here as a variant of Blackites dupuisii.
I.e. It is a subjective junior synonym, but some workers many find it useful for some studies (e.g. experienced biostratigraphers working with abundant, well preserved material), but for most purposes differentiating it is not reccomended. Please do use the comments section at the bottom of this page if you wish to discuss this interpretation


Classification: ntax_cenozoic -> Syracosphaerales -> Rhabdosphaeraceae -> Blackites -> B. clavus group -> Blackites dupuisii -> Blackites cf. B. dupuisii
Sister taxa: B. cf. B. dupuisii

Taxonomy:

Citation: Blackites cf. B. dupuisii (Steurbaut, 1990) Bown, 2005
Taxonomic rank: species
Basionym: Naninfula dupuisii Steurbaut, 1990

Distinguishing features:
Parent taxon (Blackites dupuisii): Spine tall, tapering, hollow; broad at its base but tapering and narrow in its upper half. Two or three spine-cycles are seen low on the spine, along with striated ornamentation. Spine height is usually 2-3x basal width.
This taxon: Like B. dupuisii but the spine tapers uniformly from its wide base.

Farinacci & Howe catalog pages:

Search data:
LITHS: planolith, circular, elliptical, CA: ca_disjunct, grill, process,
Lith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP15 zone (42.87-46.29Ma, base in Lutetian stage). Data source: [PRB rough estimate]

Plot of occurrence data:

References:

Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs O

Steurbaut, E. (1990). Ypresian calcareous nannoplankton biostratigraphy and palaeogeography of the Belgian Basin. Bulletin de la Société Belge de Géologie. 97(1988): 251-285. gs


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Blackites cf. B. dupuisii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-3-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=92 Go to Archive.is to create a permanent copy of this page - citation notes
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