Lithoptychius janii

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

Distinguishing features: Cylindrical column with narrow waist and a wide, disc-like apical cycle that is crystallographically distinct.


Citation: Lithoptychius janii (Perch-Nielsen, 1971) Aubry in Aubry et al. 2011
Rank: Species
Basionym: Fasciculithus janii Perch-Nielsen, 1971
Variants: These are all very similar in morphology and stratigraphic range, so for practical taxonomy separating them does not seem productive. See Aubry et al. (2011, 2012) for explanation of the differences. Monechi et al. (2012, 2013) do not separate them.
Notes & discussion: This species is discussed at length by Moenechi et al. 2012

Farinacci & Howe catalog pages: Fasciculithus bitectus * Fasciculithus janii * Fasciculithus merloti + * Fasciculithus stonehengei * Lithoptychius stegastos *

Distinguishing features: Cylindrical column with narrow waist and a wide, disc-like apical cycle that is crystallographically distinct.

Search data:
TagsLITHS: nannolith-radiate, cylindrical, circular, RIM: tiered,
CSPH: not known, V-UNITS: upper-tier, R-UNITS: lower-tier, DETAILS: isogyres radial,
MetricsLith size: 5->10µm;
Sources: size (width) from ODs & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Top high in NP5 according to Monechi et al. 2013
Last occurrence (top): in mid part of NP6 zone (50% up, 59.3Ma, in Thanetian stage). Data source: Varol, 1989, fig. 12.4
First occurrence (base): near top of NP4 zone (85% up, 61.8Ma, in Danian stage). Data source: Varol, 1989, fig. 12.4; Monechi et al. 2013, fig 6

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Lithoptychius janii, synonyms included - Fasciculithus bitectus; Fasciculithus janii; Fasciculithus stonehengei; Fasciculithus stonhengii; space-time plot :: Samples map :: Parent: Lithoptychius


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

    Haq, B. U. & Aubry, M. -P. (1980). Early Cenozoic calcareous nannoplankton biostratigraphy and palaeobiogeography of North Africa and the Middle East and trans-Tethyan correlations. In, Salem, M. J. & Busrewil, M. T. (eds) The geology of Libya. Academic Press, London 271-304. gs

    Monechi, S., Reale, V., Bernaola, G. & Balestra, B. (2012). Taxonomic review of early Paleocene fasciculiths. Micropaleontology. 58(4): 351-365. 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

    Perch-Nielsen, K. (1971a). Einige neue Coccolithen aus dem Paläozän der Bucht von Biskaya und dem Eozän der Labrador See. Bulletin of the Geological Society of Denmark. 21: 347-361. 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: 231-. gs

    Varol, O. (1989c). Palaeocene calcareous nannofossil biostratigraphy. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications. Ellis Horwood, Chichester 265-310. gs


    Lithoptychius janii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-6-2019

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