Distinguishing features:
Parent taxon (Lithraphidites): Bladed, rod-shaped nannoliths typically tapering at both ends and with a cruciform cross-section and variably developed lateral projections; crystallographic c-axis perpendicular to length
This taxon: Lithraphidites with four narrow, triangular processes projecting outwards from the rod
Th74pl03 8.JPG
Crux 1980 pl5-5 18.JPG
Th74pl03 5-7 9-11.JPG
Kanungo et al 2020 f8 11-12.JPG
Lees 2007 pl02 21-22.jpg
Linnert2010pl2-09.JPG
Puttmann & M 2019 pl2 fig02.jpg
Puttmann et al 2018 fig4 21.jpg
Puttmann et al 2019 fig5 W.jpg
Puttmann et al 2019 fig5 X.jpgSub-taxa & variants (time control age-window is: 0-800Ma) | ||||
 |  |  |  | Lithraphidites acutus subsp. acutus Lithraphidites with four narrow, triangular processes projecting orthogonally from a position at or near the centre of the main rod. |
 |  |  |  | Lithraphidites acutus subsp. eccentricus Lithraphidites with four narrow, triangular processes projecting orthogonally from a position ⅔ to ¾ along the main rod. |
Taxonomy:
Farinacci & Howe catalog pages: L. acutum * , L. acutum eccentricum *
Distinguishing features:
Parent taxon (Lithraphidites): Bladed, rod-shaped nannoliths typically tapering at both ends and with a cruciform cross-section and variably developed lateral projections; crystallographic c-axis perpendicular to length
This taxon: 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:
Size:
Ecology & Biogeography
Biology & life-cycles
Phylogenetic relations
| LITHS: nannolith-other, rod-shaped, CA: process, CROSS-POLARS: T-prominent, |
| Lith size: 8->30µm; Segments: 4->4; Data source notes: range of sub-species |
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 O Crux, J. A. (1980). A biostratigraphical study of Upper Cretaceous nannofossils from South-east England and North France. PhD thesis, University College London. -. gs Kanungo, S., Bown, P. R. & Gale, A. S. (2020). Cretaceous (Albian-Turonian) calcareous nannofossil biostratigraphy of the onshore Cauvery Basin, southeastern India. Cretaceous Research. 118 [2021]: 1-22. 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 O 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 Püttmann, T. & Mutterlose, J. (2019). Calcareous nannofossils from a Late Cretaceous nearshore setting. Journal of Nannoplankton Research. S4: 81-88. gs V O Püttmann, T., Linnert, C., Dölling, B. & Mutterlose, J. (2018). Deciphering Late Cretaceous (Cenomanian to Campanian) coastline dynamics in the southwestern Münsterland (northwest Germany) by using calcareous nannofossils: Eustasy vs local tectonics,. Cretaceous Research. 87: 174-184. gs Püttmann, T., Mutterlose, J., Kaplan, U. & Scheer, U. (2019). Reworking of Cenomanian ammonites decoded by calcareous nannofossils (southern Münsterland Basin, northwest Germany). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291(1): 1-17. 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 V O 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. gs V OReferences:
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Lithraphidites acutus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-1-2023
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10576 Go to Archive.is to create a permanent copy of this page - citation notes |
Comments
(1)
Hi Jeremy
How can the species L. acutus have a short stratigraphic range then both the sub species L. acutus acutus and L. acutus eccentricum. What is the correct range for this species and subspecies?
You are right - the species range should be the sum of the sub-species ranges. What has happened here is that when I added in the sub=species I used the ranges from Watkins & Bowdler 1984 without noticing that there was more precise range information on the species from Burnett 1998. I will change the sub-species ranges, thanks for pointing this out.