Nannotax3 - ntax_mesozoic - Helicolithus sp. Nannotax3 - ntax_mesozoic - Helicolithus sp.

Helicolithus sp.


Classification: ntax_mesozoic -> Eiffellithales -> Eiffellithaceae -> Helicolithus -> Helicolithus sp.
Sister taxa: H. anceps, H. trabeculatus, H. leckiei, H. tectufissus ⟩⟨ H. turonicus, H. varolii, H. compactus, H. blairiae, H. sp.

Distinguishing features:
Parent taxon (Helicolithus): Loxolith coccoliths with bicyclic rim with broad inner cycle and narrow central-area, filled by broad cross bars. The rim image is distinctly bicyclic and the inner cycle and cross bars are birefringent. 
This taxon: Specimens not identified to species level


Taxonomy:

Citation: Helicolithus sp.
taxonomic rank: generic level id

Farinacci & Howe catalog pages:

Distinguishing features:
Parent taxon (Helicolithus): Loxolith coccoliths with bicyclic rim with broad inner cycle and narrow central-area, filled by broad cross bars. The rim image is distinctly bicyclic and the inner cycle and cross bars are birefringent. 
This taxon: Specimens not identified to species level


Morphology:

We are using this category for images of specimens which can be identified to generic level but have not been definitively assigned to a single species.

Search data:
Lith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within (-Ma, top in "Holocene" stage). Data source:
First occurrence (base): within (-Ma, base in "Holocene" stage). Data source:

Plot of occurrence data:

References:

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

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs O

Kita, Z. A., Watkins, D. K. & Bergen, J. A. (2016). A new calcareous nannofossil species of the genus Helicolithus from the Santonian and its biostratigraphic significance in the Cretaceous Western Interior Seaway. Journal of Nannoplankton Research. 36(1): 77-82. gs


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Helicolithus sp. compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2024

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10510 Go to Archive.is to create a permanent copy of this page - citation notes
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