Nephrolithus frequens


Classification: Mesozoic -> Podorhabdales -> Axopodorhabdaceae -> Nephrolithus -> Nephrolithus frequens
Sister taxa: N. corystus, N. frequens, N. sp.,

Distinguishing features: Central area with 2-15 perforations each surrounded by neat rings of rhombic elements


Daughter taxa: (blue => in age window 0-800Ma)
Forms of N. frequens, with >2 holes in the central area (usually larger than N. frequens miniporus)
Reniform to elliptical subspecies of N. frequens with only two holes within the central area.

Taxonomy:

Citation: Nephrolithus frequens Górka, 1957
Rank: Species
Synonyms: List from Pospichal & Wise (1990), same list given by Prins & Sissingh, in Sissingh (1977) 

Farinacci & Howe catalog pages: Nephrolithus frequens + * , Nephrolithus gorkae * , Nephrolithus furcatus * , Nephrolithus trientis * , Nephrolithus barbarae * ,

Distinguishing features: Central area with 2-15 perforations each surrounded by neat rings of rhombic elements

Geological Range:
Notes: FAD highly diachronous, occuring later in N. Europe, UC20b (Burnett 1998)
Last occurrence (top): within Late Maastrichtian Substage (66.04-69.91Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): within UC19 zone (69.18-70.14Ma, base in Maastrichtian stage). Data source: Burnett 1998, Watkins et al. 1996, Pospichal & Wise 1990

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Nephrolithus frequens, synonyms included - Naphrolithus frequens; Nephrolithus frequens; Nephrolithus frequens frequens; space-time plot :: Samples map :: Parent: Nephrolithus

    References:

    Åberg, M. (1966). Electron microscope studies on Nephrolithus (Coccolithophoraceae). Stockholm Contributions in Geology. 13: 63-67. gs

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

    Górka, H. (1957). Les Coccolithophoridés du Maestrichtien supérieur de Pologne. Acta Palaeontologica Polonica. 2: 239-284. gs

    Pospichal, J. J. & Wise, S. W. (1990b). 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

    Sissingh, W. (1977). Biostratigraphy of Cretaceous calcareous nannoplankton. Geologie en Mijnbouw. 65(1): 37-65. gs

    Watkins, D. K., Wise, S. W., Pospichal, J. J. & Crux, J. (1996). Upper Cretaceous calcareous nannofossil biostratigraphy and paleoceanography of the Southern Ocean. In, Moguilevsky, A. & Whatley, R. (eds) Microfossils and Oceanic Environments. University of Wales, Aberystwyth Press 355-381. gs


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    Nephrolithus frequens compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10798 Go to Archive.is to create a permanent copy of this page - citation notes



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