Isthmolithus unipons


Classification: ntax_cenozoic -> Zygodiscales -> Zygodiscaceae -> Isthmolithus -> Isthmolithus unipons
Sister taxa: I. recurvus, I. rhenanus, I. unipons, I. sp.

Taxonomy:

Citation: Isthmolithus unipons Bramlette & Sullivan, 1961
Rank: Species

Distinguishing features: Narrowly elliptical to oblong (or parallelogram-like), relatively high muroliths with one transverse bar.

Farinacci & Howe catalog pages: I. unipons *

Search data:
TagsLITHS: murolith, elliptical, quadrate, CA: ca_conjunct, bar, CROSS-POLARS: rim-unicyclic, V-prominent,
MetricsLith size: 5->7µm;
Data source notes: lith size from OD
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP12 zone (50.50-53.70Ma, top in Ypresian stage). Data source: Perch-Nielsen 1985b
First occurrence (base): within NP12 zone (50.50-53.70Ma, base in Ypresian stage). Data source: Perch-Nielsen 1985

Plot of occurrence data:

References:

Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs

Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs

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Isthmolithus unipons compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-4-2021

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