Nannotax3 - ntax_cenozoic - Reticulofenestra minuta

Citation: Reticulofenestra minuta Roth, 1970

Synonyms: Reticulofenestra alabamensis Roth, 1970

Taxonomic discussion: Used in a broad sense for very small (<3μm), elliptical reticulofenestrids. Although they typically have open central areas, in SEM many specimens are seen with closed central areas and at this size it may be difficult to distinguish the different varieties in LM. SEM observations suggest there is considerable diversity of form in this size range. [Bown & Newsam 2017]

Distinguishing features: Coccoliths very small, <3µm. Probably includes several different species.

Size: Type material length 1.5-2µm

Geological Range:
Notes: Theis name is applied from the Eocene to the Pliocene to very small Reticulofenestra specimens.
Last occurrence (top): within Pliocene Epoch (2.59-5.33Ma, top in Piacenzian stage). Data source: Young 1998
First occurrence (base): within NP13 zone (49.11-50.50Ma, base in Ypresian stage). Data source: [PRB rough estimate]

References:

Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs V O

Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs V O

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 V O

Bown, P. R., Gibbs, S. J., Sheward, R., O’Dea, S. & Higgins, D. (2014). Searching for cells: the potential of fossil coccospheres in coccolithophore research. Journal of Nannoplankton Research. 34(special): 5-21. gs V O

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

Jones, A. P. & Dunkley Jones, T. (2020). Middle Eocene to Early Oligocene calcareous nannofossils from the Nanggulan Formation, Java, Indonesia. Journal of Nannoplankton Research. 30(1): 57-79. gs V O

Roth, P. H. (1970). Oligocene calcareous nannoplankton biostratigraphy. Eclogae Geologicae Helvetiae. 63: 799-881. gs V O

Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 26(1): 33-59. gs V O

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V O

Comments (1)

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Ines Galovic (Zagreb)

Fig. 01 and 02 of BownNewsam 2017 is much closer to R. producta regarding to (nearly) closed central area as distinguishing feature in original description and I would be placed there.

All best :)

7th May 2019 1:05pm

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Tags	LITHS: placolith, elliptical, CA: ca_conjunct, grill, vacant, CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
Metrics	Lith size: 1->3µm;

Reticulofenestra minuta

References:

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