Lees 2007 pl02 21-22.jpg
Linnert2010pl2-09.JPG
Th74pl03 5-7 9-11.JPG
Th74pl03 8.JPG
Distinguishing features:
Lithraphidites with four narrow, triangular processes projecting outwards from the rod
Lees 2007 pl02 21-22.jpg
Linnert2010pl2-09.JPG
Th74pl03 5-7 9-11.JPG
Th74pl03 8.JPG| Daughter taxa: (blue => in age window 0-800Ma) | ||||
 |  |  | Lithraphidites with four narrow, triangular processes projecting orthogonally from a position at or near the centre of the main rod. | |
 |  |  |  | Lithraphidites with four narrow, triangular processes projecting orthogonally from a position two thirds to three quarters along the main rod. |
Taxonomy:
Farinacci & Howe catalog pages: Lithraphidites acutum * , Lithraphidites acutum eccentricum *
Distinguishing features:
Lithraphidites with four narrow, triangular processes projecting outwards from the rod
Lithraphidites acutus eccentricus and Lithraphidites acutus acutus may be palaeobiogeographic variants (Watkins in Watkins & Bowdler, 1984).
Morphology remarks:
Geological Range:
Last occurrence (top): at top of UC4b subzone (100% up, 94.4Ma, in Cenomanian stage). Data source: Burnett 1998 (zonal marker)
First occurrence (base): at base of UC3a subzone (0% up, 96.2Ma, in Cenomanian stage). Data source: Burnett 1998 (zonal marker), fig.6.2
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 Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs Linnert, C., Mutterlose, J. & Erbacher, J. (2010). Calcareous nannofossils of the Cenomanian/Turonian boundary interval from the Boreal Realm (Wunstorf, northwest Germany). Marine Micropaleontology. 74: 38-58. gs Manivit, H., Perch-Nielsen, K., Prins, B. & Verbeek, J. W. (1977). Mid Cretaceous calcareous nannofossil biostratigraphy. Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. B80(3): 169-181. gs Thierstein, H. R. (1974). Calcareous nannoplankton - Leg 26, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 26: 619-667. gs Watkins, D. K. & Bowdler, J. L. (1984). Cretaceous calcareous nannofossils from Deep Sea Drilling Project Leg 77, southeast Gulf of Mexico. Initial Reports of the Deep Sea Drilling Project. 77: 649-674. gsReferences:
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Lithraphidites acutus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-10-2019
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