Nannotax3 - ntax_cenozoic - Blackites atanii

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Blackites atanii

Classification: ntax_cenozoic -> Syracosphaerales -> Rhabdosphaeraceae -> Blackites -> B. morionum group -> Blackites atanii
Sister taxa: B. atanii, B. deflandrei, B. hayi, B. mericii, B. morionum, B. shafikii, B. australiensis, B. elongatus, B. perfectus, B. prolatus, B. rothii

Varol 1989 Sile pl4 28-30.jpg
Varol 1989 Sile pl4 25-7.jpg
Bown_2005_JNR_pl23-fig16.jpg
Bown_2005_JNR_pl23-fig17.jpg
Bown_2005_JNR_pl23-fig18.jpg
Bown_2005_JNR_pl23-fig19.jpg
Bown_2005_JNR_pl23-fig20.jpg

Taxonomy:

Citation: Blackites atanii (Varol, 1989) Bown, 2005

Taxonomic rank: species

Basionym: Cruxia atanii Varol, 1989

Taxonomic discussion: Resembles B. morionum but the spine broadens from a narrow neck at the spine base.

Distinguishing features:
Parent taxon (B. morionum group): Spine low, globular, height<2x width
This taxon: Spine relatively low, hollow sacculiformt; broadens rapidly from narrow base, then tapers to form low, pointed dome.
Typically the spine height and width are similar and the spine is similar in width or slightly wider than the base.

Farinacci & Howe catalog pages: C. atanii *

Search data:

LITHS: planolith, circular, elliptical, CA: ca_disjunct, grill, process,

Lith size: 2->6µm;
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 NP15b subzone (44.12-45.49Ma, top in Lutetian stage). Data source: Bown 2005
First occurrence (base): within NP9 zone (55.86-57.21Ma, base in Thanetian stage). Data source: [PRB rough estimate]

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: B. morionum group

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

Varol, O. (1989b). Eocene calcareous nannofossils from Sile (northwest Turkey). Revista Española de Micropaleontología. 21: 273-320. gs

Blackites atanii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-1-2025

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=89 Go to Archive.is to create a permanent copy of this page - citation notes

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