Nannotax3 - ntax_mesozoic - Lithraphidites acutus

Lithraphidites with four narrow, triangular processes projecting outwards from the rod

Citation: Lithraphidites acutus Verbeek & Manivit in Manivit et al., 1977

Lithraphidites with four narrow, triangular processes projecting outwards from the rod

Morphology:

Lithraphidites acutus eccentricus and Lithraphidites acutus acutus may be palaeobiogeographic variants (Watkins in Watkins & Bowdler, 1984).

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

References:

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

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 V 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

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 O

Comments (1)

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Maurice Kevin Cooper

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?

31st July 2017 12:06pm

Jeremy Young (UK)

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.

31st July 2017 12:13pm

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Tags	LITHS: nannolith-other, rod-shaped, CA: process, CROSS-POLARS: T-prominent,
Metrics	Lith size: 8->30µm; Segments: 4->4; Data source notes: range of sub-species

Daughter taxa (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.

Lithraphidites acutus

References:

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