Nannotax3 - ntax_cenozoic - Solisphaera tegula Nannotax3 - ntax_cenozoic - Solisphaera tegula

Solisphaera tegula


Classification: ntax_cenozoic -> Syracosphaerales -> Rhabdosphaeraceae -> Solisphaera -> Solisphaera tegula
Sister taxa: S. blagnacensis, S. emidasia, S. helianthiformis, S. galbula, S. turbinella ⟩⟨ S. tegula, S. palmula ⟩⟨ S. miocaenica, D. moori, S. sp.

Taxonomy:

Citation: Solisphaera tegula Bown 2016
taxonomic rank: Species
Synonyms: Solisphaera sp. Bown et al. 2009
Taxonomic discussion: These fossil specimens are most closely comparable to the living species Solisphaera emidasia Bollmann et al., 2006 and S. blagnacensis Bollmann et al., 2006. [Bown 2016]

Distinguishing features:
Parent taxon (Solisphaera): Coccoliths without radial lath cycle; coccosphere dome-shaped, polymorphic
This taxon: CCs with trapezoidal protrusions, flat or slightly curved; BCs not known (Eocene-Palaeocene)

Farinacci & Howe catalog pages: S. tegula *


Morphology:

Small, broad, flat or slightly curving, tapered-trapezoid processes formed from miniscule, overlapping, elongate elements. The elements are arranged in over 30 rows and slope from upper left to lower right. [Bown 2016]
Remarks: The younger, Middle Eocene specimens have an additional row of elements with different orientation at the narrower end of the process, which may be where the process joined the basal coccolith (Pl.13, fig. 15). [Bown 2016]
Differentiation: In extant species the elements forming the process, slope from lower left to upper right. This gives the impression of a major difference in orientation, but may simply be a product of different element shape (i.e., elongation) with no change in crystallographic orientation. The ‘basal’ cycle is not so conspicuous in published images of extant specimens. [Bown 2016]

Size:
length 2.4–3.3μm; width 2.1–2.9μm [Bown 2016]

Search data:
LITHS: planolith, elliptical, CA: ca_disjunct, process,
Lith size: 2->3.5µm;
Data source notes: lith size from OD
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Originally desribed from the Paleoceene - Eocene of Tanzania by Bown (2009) and Bown et al. (2014), subsequwntly observed in  the Earlu Miocen of the Maldives by Young et al. (2021).This patchy record reflects the need for very good preservation and SEM study to identify the species, so it is quite possible it may have a significantly longer range. 
Last occurrence (top): within NN1 zone (22.82-23.13Ma, top in Aquitanian stage). Data source: Young et al. 2021
First occurrence (base): within NP6 zone (58.97-59.54Ma, base in Selandian stage). Data source: Bown 2016

Plot of occurrence data:

References:

Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs O

Bown, P. R., Young, J. R., Dunkley Jones, T. & Randell, R. (2009). A Paleogene record of extant lower photic zone calcareous nannoplankton. Palaeontology. 52(2): 457-469. gs

Young, J. R., Archontikis, O. A., Su, X., Pratiwi, S. D. & (2021). Nannofossil palaeoecology of Lower Miocene sapropels from IODP Expedition 359, the Maldives. Palaeogeography Palaeoclimatology Palaeoecology. 571: 1-15. gs

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Solisphaera tegula compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-10-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1260 Go to Archive.is to create a permanent copy of this page - citation notes
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