arrayname: original 
Nannotax3 - ntax_cenozoic - Blackites bipartitus Nannotax3 - ntax_cenozoic - Blackites bipartitus

Blackites bipartitus


Classification: ntax_cenozoic -> Syracosphaerales -> Rhabdosphaeraceae -> Blackites -> B. clavus group -> Blackites bipartitus
Sister taxa: B. bipartitus, B. clavus, B. dupuisii, B. gamai, B. spiculiformis, B. thiedei

Taxonomy:

Citation: Blackites bipartitus Bown, 2005
Taxonomic rank: species
Taxonomic discussion: The two-part spine structure is similar to that seen in Blackites deflandrei and Blackites pseudomoronium, but the lower-spine unit is smaller and the upper cycle longer.

Distinguishing features:
Parent taxon (B. clavus group): Spine conical, tapering with maximum width near base
This taxon: Spine vase-shaped constructed from two distinct structural units when viewed in XPL. Typically the height is about 2x the width, and the maximum spine width is similar to base width.

Farinacci & Howe catalog pages: B. bipartitus *


Morphology:

The short lower-spine unit broadens away from the base and the longer, upper-spine cycle tapers to a point. The rim is dominated by the inner of the two cycles; the outer cycle does not lie distally over the inner cycle.

Search data:
LITHS: planolith, circular, elliptical, CA: ca_disjunct, grill, process,
Lith size: 5->8µm;
Data source notes: lith size (spine height) from OD & slightly extended
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP15a subzone (45.49-46.29Ma, top in Lutetian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP14b subzone (46.29-47.84Ma, 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


nannotaxlogo400px

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

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=90 Go to Archive.is to create a permanent copy of this page - citation notes
nannotaxlogo400px

Nannotax is being sponsored through 2024 by Woodside Energy and Shell USA


Add Comment

* Required information
Captcha Image

Comments

No comments yet. Be the first!