Classification: ntax_cenozoic -> Discoasterales -> Fasciculithaceae -> Fasciculithus
Sister taxa: Diantholitha, Fasciculithus, Gomphiolithus, Lithoptychius

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
F. alanii group
Conical-shaped fasciculiths

F. involutus group
Cylindrical fasciculiths

F. schaubii group
Ornate fasciculiths - with prominent fenestrae and sculpted outlines

Fasciculithus sp.
Specimens which cannot be assigned to any established species


Citation: Fasciculithus Bramlette & Sullivan, 1961
Rank: Genus
Type species: Fasciculithus involutus Bramlette & Sullivan, 1961.
Taxonomic discussion: The subdivison into groups given here is based on Bown (2010).

Distinguishing features: Conical or cylindrical fasciculiths formed of a single cycle of elements, outer surface is usually covered by fenestrae.

Farinacci & Howe catalog pages: Fasciculithus + *

Morphology: The c-axes are aligned radially in plan view but are inclined upward in side view. Hence the two halves of the nannolith show opposite extinction colours with a gypsum plate when vertical, with the left side blue in standard orientation (Romein 1979). Ths also means that in side view the nannolith does not go entirely into extinction in any position.

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical,
MetricsLith size: 4->20µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Agnini et al. 2007 place top of Fasciculithus low (ca 20% up) in NP10
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): near base of Selandian Stage (5% up, 61.5Ma, in Selandian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Agnini, C., Fornaciari, E., Raffi, I., Rio, D., Rohl, U. & Westerhold, T. (2007a). High-resolution nannofossil biochronology of middle Paleocene to early Eocene at ODP Site 1262: Implications for calcareous nannoplankton evolution. Marine Micropaleontology. 64: 215-248. gs

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

Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gs V O

Steurbaut, E. & Sztrákos, K. (2008). Danian/Selandian boundary criteria and North Sea Basin–Tethys correlations based on calcareous nannofossil and foraminiferal trends in SW France. Marine Micropaleontology. 67: 1-29. gs


Fasciculithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=564 Go to Archive.is to create a permanent copy of this page - citation notes

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