Nannotax3 - ntax_main - Reticulofenestra nanggulanensis Nannotax3 - ntax_main - Reticulofenestra nanggulanensis

Reticulofenestra nanggulanensis


Classification: ntax_main -> Isochrysidales -> Noelaerhabdaceae -> Reticulofenestra -> R. reticulata group -> Reticulofenestra nanggulanensis
Sister taxa: R. reticulata, R. isabellae, R. erbae, R. nanggulanensis, R. westerholdii, C. helianthus, R. sp. cf. reticulata


Taxonomy:
Citation: Reticulofenestra nanggulanensis Jones & Dunkley Jones 2020
Taxonomic rank: species
Basionym: Reticulofenestra nanggulanensis * Jones & Dunkley Jones 2020
Taxonomic discussion: This species was described in 2020 and most of the images included here were originally assigned to R. reticulata. 

Synonyms:

Distinguishing features:
Parent taxon (R. reticulata group): Typically circular reticulofenestrids with relatively narrow circular central area with robust grill (clearly visible in lm).
This taxon: Like R. reticulata but smaller (5-8 µm) and with wide central area (ca 1.5x rim width)


Morphology:
Small to medium, subcircular reticulofenestrid, with a distinct, wide central-area (>1.5 times the rim width). The central-area is spanned by a visible (birefringent) net.
Differentiation: Similar to R. reticulata, but has a distinctly wider central-area, which varies from broadly elliptical to subcircular. [Jones & Dunkley Jones 2020]

Size:
5-8 µm - Jones & Dunkley Jones (2020) give sizes of 12specimens ranging from 5.02 to 7.2 µm

Search data:
LITHS: placolith, circular, elliptical, CA: grill,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
Lith size: 5->8µm;
Data source notes: Range of specimens included by Jones & Dunkley Jones 2020
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes:

Most common in CNE15 (NP17), and more common than other members of the R. reticulata group in this core. Consistently observedup to the top of CNE19 (NP19/20), and present to the top of CNO1 (NP21)  [Jones & Dunkley Jones 2020]


Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: Jones & Dunkley Jones 2020
First occurrence (base): within NP17 zone (37.32-40.40Ma, base in Bartonian stage). Data source: Jones & Dunkley Jones 2020

Plot of occurrence data:

References:

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 O

De Kaenel, E. & Mojon, P. -O. (2023). Calcareous nannofossil biostratigraphy of the Eocene/Oligocene boundary (Zones NP19–21) in the parautochthonous Subalpine UMM of the Swiss Molasse Basin (Canton Fribourg, Western Switzerland). Journal of Nannoplankton Research. 41(2): 64-96. gs O

Fornaciari, E., Agnini, C., Catanzariti, R., Rio, D., Bolla, E. M. & Valvasoni, E. (2010a). Mid- Latitude calcareous nannofossil biostratigraphy and biochronology across the middle to late Eocene transition. Stratigraphy. 7(4): 229-264. 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. 38(1): 57-79. gs

Perch-Nielsen, K. (1971c). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs 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. 36(1): 33-59. gs O


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Reticulofenestra nanggulanensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-7-2026

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1672 Go to Archive.is to create a permanent copy of this page - citation notes



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