Lithraphidites acutus


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

Distinguishing features:

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


Daughter taxa: (blue => in age window 0-300Ma)
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 two thirds to three quarters along the main rod.

Taxonomy:

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

Farinacci & Howe catalog pages: Lithraphidites acutum * Lithraphidites acutum eccentricum *

Distinguishing features:

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


Morphology remarks:

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

Plot of occurrence data:

References:

Burnett, J.A., (1998). Upper Cretaceous. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 132-199.

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.

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.

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Lithraphidites acutus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-7-2018

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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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