Distinguishing features:
Parent taxon (Nephrolithus frequens): Central area with 2-15 perforations each surrounded by neat rings of rhombic elements
This taxon: Reniform to elliptical subspecies of N. frequens with only two holes within the central area.
Farinacci & Howe catalog pages:
N. miniporus *
| LITHS: placolith, asymmetric, CA: ca_disjunct, plate, pores, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
| Lith size: 4->7µm; Data source notes: Pospichal & Wise 1990 |
Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.17Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): in mid part of UC20c subzone (50% up, 67.6Ma, in Maastrichtian stage). Data source: Burnett 1998
Plot of occurrence data:
Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O Ehrendorfer, T. W. (1994). The calcareous nannofossil species Nephrolithus frequens Gorka (1957) and its morphotypes. Journal of Paleontology. 68(2): 191-200. gs Pospichal, J. J. & Bralower, T. J. (1992). Calcareous Nannofossils Across the Cretaceous/Tertiary Boundary, Site 761, Northwest Australian Margin. Proceedings of the Ocean Drilling Program, Scientific Results. 122: 735-752. gs Pospichal, J. J. & Wise, S. W. (1990). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 465-487. gs Reinhardt, P. & Górka, H. (1967). Revision of some Upper Cretaceous Coccoliths from Poland and Germany. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 129(3): 240-256. gs Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs References:

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Nephrolithus frequens subsp. miniporus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-4-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10800 Go to Archive.is to create a permanent copy of this page - citation notes |
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