Lithraphidites acutus


Classification: ntax_mesozoic -> Nannoliths inc sedis -> Microrhabdulaceae -> Lithraphidites -> Lithraphidites acutus
Sister taxa: L. carniolensis ⟩⟨ L. charactozorro, L. grossopectinatus, L. kennethii, L. praequadratus, L. quadratus ⟩⟨ L. acutus, L. alatus, L. pseudoquadratus ⟩⟨ L. bollii, L. houghtonii, L. moray-firthensis, L. sp.

Distinguishing features:

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


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.

Taxonomy:

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

Farinacci & Howe catalog pages: L. acutum * , L. acutum eccentricum *

Distinguishing features:

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).

Search data:
TagsLITHS: nannolith-other, rod-shaped, CA: process, CROSS-POLARS: T-prominent,
MetricsLith size: 8->30µm; Segments: 4->4;
Data source notes: range of sub-species
The morphological data given here can be used on the advanced search page. See also these notes

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:

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


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Lithraphidites acutus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10576 Go to Archive.is to create a permanent copy of this page - citation notes



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?

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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.

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