Biantholithus


Classification: ntax_cenozoic -> Coccolith families inc sed -> Coccolith genera inc sed -> Biantholithus
Sister taxa: Aliculosphaera, Biantholithus, Camuralithus, Centumgemina, Ellipsolithus, Gladiolithus, Ilselithina, Leesella, Pedinocyclus, Petasus

Daughter taxa (time control age-window is: 0-800Ma)
Biantholithus astralis
Biantholithus with 7-8 visible elements/rays in LM, which are not in contact in their outer part..
Biantholithus flosculus
Medium sized circular, rossette shaped nannolith with 11-16 radial rays. Weakly birefringent in XPL.
Biantholithus hughesii
Biantholithus with six visible elements/rays in LM, which are not in contact in their outer part..
Biantholithus sparsus
Biantholithus with 8-12 visible elements/rays in LM.
Biantholithus sp.
Specimens which cannot be assigned to any established species

Taxonomy:

Citation: Biantholithus Bramlette & Martini, 1964
Rank: Genus
Type species: Biantholithus sparsus Bramlette & Martini, 1964
Taxonomic discussion: The shields are unicyclic and coccospheres have been observed.

Distinguishing features: Circular to stellate placoliths contructed from 6-12, large, radial elements. Often give the appearance of stellate nannoliths with low birefringence in LM.

Farinacci & Howe catalog pages: Biantholithus *

Search data:
TagsLITHS: placolith, circular, CA: closed,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 4->15┬Ám;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in lower part of Ypresian Stage (22% up, 54.2Ma, in Ypresian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Danian Stage (0% up, 66Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bramlette, M. N. & Martini, E. (1964). The great change in calcareous nannoplankton fossils between the Maestrichtian and Danian. Micropaleontology. 10(2): 291-322. 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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Biantholithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=71 Go to Archive.is to create a permanent copy of this page - citation notes



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