Distinguishing features:
Parent taxon (Axopodorhabdaceae): Regular placoliths; central-area, with cross-bars or perforated plate; often with tall, hollow spines.
Distal shield elements non-imbricate V-units; proximal shield and inner cycle formed from R-units. Rim often appears beaded in LM
This taxon: Reniform; central-area net with two to numerous pores
Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa | ||||
Nephrolithus corystus Central area with 2-60 perforations each defined by rather irregular elongate crystals | |||||
Nephrolithus frequens Central area with 2-15 perforations each surrounded by neat rings of rhombic elements | |||||
Nephrolithus sp. Specimens not identified to species level |
Taxonomy:
Farinacci & Howe catalog pages: Nephrolithus + *
Distinguishing features:
Parent taxon (Axopodorhabdaceae): Regular placoliths; central-area, with cross-bars or perforated plate; often with tall, hollow spines.
Distal shield elements non-imbricate V-units; proximal shield and inner cycle formed from R-units. Rim often appears beaded in LM
This taxon: Reniform; central-area net with two to numerous pores
Search data:
LITHS: placolith, asymmetric, CA: ca_disjunct, plate, pores, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Lith size: 4->16µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within UC15d subzone (75.85-76.77Ma, base in Campanian stage). Data source: Total of ranges of species in this database
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 Górka, H. (1957). Les Coccolithophoridés du Maestrichtien supérieur de Pologne. Acta Palaeontologica Polonica. 2: 239-284. gs Wind, F. H. & Wise, S. W. (1983). Correlation of upper Campanian-lower Maestrichtian calcareous nannofossil assemblages in drill and piston cores from the Falkland Plateau, southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 551-563. gs Wind, F. H. (1983). The genus Nephrolithus Górka, 1957 (Coccolithophoridae). Journal of Paleontology. 57: 157-161. gsReferences:
Nephrolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-10-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10796 Go to Archive.is to create a permanent copy of this page - citation notes |
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