views1 Nannotax3 - ntax_cenozoic - Blackites shafikii Nannotax3 - ntax_cenozoic - Blackites shafikii

Blackites shafikii


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

Taxonomy:

Citation: Blackites shafikii Dunkley Jones et al., 2009
Taxonomic rank: species
Synonyms: Possibly a junior synonym of Cepekiella elongata Roth 1970
Taxonomic discussion: Similar to the rhabdoliths described within the novel genera Amitha and Notiocyrtolithus from the upper Eocene-lower Oligocene of the Otway Basin, SE Australia (Shafik 1989), which all possess a distinct collar and low domed process. However, in the SE Australian forms a cycle of radial laths with slits between them occurs between the collar and the domed process.

Distinguishing features:
Parent taxon (B. morionum group): Spine low, globular, height<2x width
This taxon: Small, varimorphic, sub-circular to elliptical rhabdoliths with a low domed process, formed of a continuous whorl of one lamellar cycle, and a distinct collar formed from an outwardly directed lamellar cycle.

Farinacci & Howe catalog pages: B. shafikii *


Morphology:

Processes can vary from domed to conical.

Size:
Holotype length 3.6 microns, height 2.0-3.0 microns.

Search data:
LITHS: planolith, elliptical, CA: ca_disjunct, grill, process,
Lith size: 3->5µm;
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 NP19-20 zone (34.44-36.97Ma, top in Priabonian stage). Data source: Dunkley Jones et al., 2009
First occurrence (base): within NP19-20 zone (34.44-36.97Ma, base in Priabonian stage). Data source: Dunkley Jones et al., 2009

Plot of occurrence data:

References:

Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs

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Blackites shafikii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-1-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=121 Go to Archive.is to create a permanent copy of this page - citation notes
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