Nannoconus inornatus


Classification: Mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> N. abundans group -> Nannoconus inornatus
Sister taxa: N. abundans, N. alvus, N. borealis, N. concavus, N. inornatus, N. troelsenii,

Distinguishing features: squat, cylindrical; without flanges


Taxonomy:

Citation: Nannoconus inornatus Rutledge & Bown, 1996
Rank: Species

Farinacci & Howe catalog pages: Nannoconus inornatus *

Distinguishing features: squat, cylindrical; without flanges


Morphology remarks: Short, cylindrical nannoconids with thin and low angled wall cycles, and relatively narrow axial canal.
Differs from N. abundans in lacking an flanges, from N. circularis, N. globulus and N. inconspicuous in having a narrower canal, and from N. ligius in its non-petalloid profile.

Ecology & Biogeography: Mainly Boreal (North Sea Basin) distribution.

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, hollow, CA: vacant, T-UNITS: T-prominent,
MetricsLith size: 5->9µm;
Sources: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Barremian Stage (126.30-130.77Ma, top in Barremian stage). Data source: Bown et al. 1998
First occurrence (base): within Late Hauterivian Substage (130.77-133.09Ma, base in Hauterivian stage). Data source: Bown et al. 1998

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: N. abundans group

    References:

    Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs :: ::

    Rutledge, D. & Bown, P. R. (1996). New names for old: taxonomic clarification of some Early Cretaceous nannofossil marker-species. Journal of Nannoplankton Research. 18(2): 53-59. gs :: view :: open

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    Nannoconus inornatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-7-2020

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