Cylindralithus nieliae


Classification: Mesozoic -> Stephanolithiales -> Stephanolithiaceae -> Cylindralithus -> Cylindralithus nieliae
Sister taxa: C. biarcus, C. coronatus, C. sculptus, C. serratus, C. duplex, C. oweinae, C. nieliae, C. sp.,

Distinguishing features: Widest cycle elongate and constricted (figure of eight shape)


Taxonomy:

Citation: Cylindralithus nieliae Burnett, 1997
Rank: Species
Notes & discussion:

Tentatively placed in Cylindralithus because of its almost cylindrical nature but it is sufficiently different to species such as C. serratus and C. nudus for this assign-ment to be questionable. [Burnett 1997]
Pssibly the spine of a heterococcolith [my interpretation - JRY 2018]

Farinacci & Howe catalog pages: Cylindralithus nieliae *

Distinguishing features: Widest cycle elongate and constricted (figure of eight shape)


Morphology remarks:

Composed of five to six stacked rims of imbricating elements. The lowest, widest rim particularly has a median constriction which gives the form a slight 'figure-of-eight' outline in the LM. This constriction may or may not be apparent in succeeding rims. The upper-most rim is the narrowest. [Burnett 1997]

This is a distinctive taxon, being highly birefringent in the LM and having a distinctive 'figure-of-eight' outline when focusing on the widest rim. [Burnett 1997]

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Lees & Bown 2005 - consistently present to end Cret
First occurrence (base): within UC15b subzone (77.61-79.00Ma, base in Campanian stage). Data source: Burnett (1998)

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Taxon plotted: Cylindralithus nieliae, synonyms included - Cylindralithus nieliae; space-time plot :: Samples map :: Parent: Cylindralithus

    References:

    Burnett, J.A., (1997). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research, 19(2): 133-146.


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    Cylindralithus nieliae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-1-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10358Go to Archive.is to create a permanent copy of this page - citation notes



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