Distinguishing features:
Parent taxon (R. umbilicus group): Paleogene elliptical reticulofenestrids with open central area (spanned by delicate proximal net, not visible in lm)
This taxon: Large (10-15 µm) elliptical Reticulofenestra with narrow rim, flaring-collar, and very wide central area filled with a finely perforate plate divided by a median suture
| LITHS: placolith, elliptical, CA: ca_conjunct, grill, vacant, CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent, |
| Lith size: 10->15µm; |
Geological Range:
Notes: Reviewed in Persico et al. (2014) they concluded the range was within chrons C15 to C13r, which corresponds to mid NP19-20 to NP21.
Last occurrence (top): within chron C13r sub-Magnetochron (33.70-35.00Ma, top in Rupelian stage). Data source: Persico et al. (2014)
First occurrence (base): within chron C15 Magnetochron (35.00-35.71Ma, base in Priabonian stage). Data source: Persico et al. (2014)
Plot of occurrence data:
Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs Fioroni, C., Villa, G., Persico, D., Wise, S. W. & Pea, L. (2012). Revised middle Eocene-upper Oligocene calcareous nannofossil biozonation for the Southern Ocean. Revue de Micropaléontologie. 55(2): 53-70. gs Haq, B. U. (1968). Studies on upper Eocene calcareous nannoplankton from NW Germany. Stockholm Contributions in Geology. 18: 13-74. gs O Perch-Nielsen, K. (1985). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge (1): 427-555. gs Shafik, S. (1989). Some new calcareous nannofossils from Upper Eocene and Lower Oligocene sediments in the Otway Basin, southeastern Australia. Alcheringa. 13: 69-83. gs Wei, W. & Wise, S. W. (1990). Middle Eocene to Pleistocene calcareous nannofossils recovered by Ocean Drilling Program leg 113 in the Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 639-666. gs Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs OReferences:

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Reticulofenestra oamaruensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-7-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1177 Go to Archive.is to create a permanent copy of this page - citation notes |
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