Lithoptychius varolii

Classification: Coccolithophores -> Discoasterales -> Fasciculithaceae -> Lithoptychius -> Lithoptychius varolii
Sister taxa: L. billii, L. janii, L. pileatus, L. ulii, L. varolii, L. vertebratoides, L. sp.,


Citation: Lithoptychius varolii (Steurbaut and Sztràkos, 2007) Aubry in Aubry et al. 2011
Rank: Species
Basionym: Fasciculithus varolii Steurbaut and Sztràkos, 2007
Variants: These taxa are separated from each other and from L. varolii by minor details such as relative width of the three cycles.

Distinguishing features: Fasciculiths consisting of three distinct structures, including a proximal column, a middle cycle of lateral elements and a distal superimposed mushroom-shaped cone.

Farinacci & Howe catalog pages: Fasciculithus varolii * , Lithoptychius collaris * , Lithoptychius felis * , Lithoptychius schmitzii + *

Morphology remarks: Both the lateral cycle and the dome are well distinguishable as two superimposed, optically different structures in cross-polarized light in side view.

Search data:
TagsLITHS: nannolith-radiate, cylindrical, circular, RIM: tiered,
CSPH: not known, V-UNITS: mid-tier, R-UNITS: lower-tier, upper-tier, DETAILS: isogyres radial,
MetricsLith size: 4.5->8.5µm;
Sources: size (width) from ODs
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 NP4 zone (70% up, 62Ma, in Selandian stage). Data source: Monechi et al. 2013, Fig. 6
First occurrence (base): in upper part of NP4 zone (60% up, 62.2Ma, in Danian stage). Data source: Original description

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Lithoptychius


    Aubry, M. P., Bord, D. & Rodriguez, O. (2011). New taxa of the Order Discoasterales Hay 1977. Micropaleontology. 57(3): 269-287. gs

    Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs

    Monechi, S., Reale, V., Bernaola, G. & Balestra, B. (2013). The Danian/Selandian boundary at Site 1262 (South Atlantic) and in the Tethyan region: Biomagnetostratigraphy, evolutionary trends in fasciculiths and environmental effects of the Latest Danian Event. Marine Micropaleontology. 98(1): 28-40. gs

    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


    Lithoptychius varolii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-9-2019

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