Heliolithus


Classification: Coccolithophores -> Discoasterales -> Heliolithaceae -> Heliolithus
Sister taxa: Bomolithus, Heliolithus,

Daughter taxa: (blue => in age window 0-800Ma)
Two relatively thick cycles of similar diameter.
Heliolith with two birefringent cycles: a broad, thin cycle and a thin, much narrower cycle, around 1/3 of the width of the wider cycle.
Heliolith with a broad, thin cycle and a taller, narrower cycle. The narrower cycle is over 3/4 of the width of the wider cycle.
Large, heliolith with two thin birefringent cycles. The narrow cycle is around 3/4 of the width of the wider cycle.
Heliolith with two birefringent cycles: a broad, thin cycle and a tall, narrower cycle, around half of the width of the wider cycle.
Heliolith with two high, birefringent cycles, the narrower cycle is around two thirds of the width of the broader.
Specimens which cannot be assigned to any established species

Taxonomy:

Citation: Heliolithus Bramlette and Sullivan, 1961
Rank: Genus
Type species: Heliolithus riedelii Bramlette & Sullivan, 1961

Distinguishing features: Discoidal discoasteralids with birefringent appearance.

Farinacci & Howe catalog pages: Heliolithus *

Search data:
TagsLITHS: nannolith-radiate, circular, star-shaped, CROSS-POLARS: V-prominent, R-prominent,
MetricsLith size: 6->18┬Ám;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in upper part of Thanetian Stage (70% up, 56.9Ma, in Thanetian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Selandian Stage (4% up, 61.5Ma, in Selandian stage). Data source: Total of range of species in this database

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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Heliolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-10-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=698 Go to Archive.is to create a permanent copy of this page - citation notes



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