F. alanii group


Classification: Coccolithophores -> Discoasterales -> Fasciculithaceae -> Fasciculithus -> F. alanii group
Sister taxa: F. alanii group, F. involutus group, F. schaubii group, F. sp.,

Daughter taxa: (blue => in age window 0-800Ma)
Tall, wide at base but tapers rapidly to form a narrow apical cycle with pointed apex.
Small, strongly tapering, almost triangular outline.
Tapers from a broad base to a pointed apex, with straight or convex sides and a distinct ‘shoulder’ on the upper surface.
Medium-sized fasciculith with concave top and bottom surfaces and a tapering column that has at least two deep indentations, resulting in a lobate outline. Overall it has a rather angular, blocky outline.
Short fasciculith that tapers from a broad base to a pointed apex.

Taxonomy:

Citation: Fasciculithus alanii group
Rank: species group

Distinguishing features: Conical-shaped fasciculiths

Farinacci & Howe catalog pages:

Search data:
TagsLITHS: nannolith-radiate, conical, cylindrical, circular,
CSPH: not known, V-UNITS: none, R-UNITS: all, DETAILS: isogyres radial,
MetricsLith size: 4->9µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: predominantly occur in the Late Paleocene diversification of Fasciculithus
Last occurrence (top): near base of Ypresian Stage (5% up, 55.6Ma, in Ypresian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Thanetian Stage (3% up, 59.1Ma, in Thanetian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31: 11-38. gs


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F. alanii group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-8-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=559 Go to Archive.is to create a permanent copy of this page - citation notes



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