Taxonomy:
One of the specimens included by Bukry (1973) in his original description (his plate 2 fig 1) is better placed in F. janii, and hence the two species have been confused in the literature - see Steurbaut & Sztrakos (2008), Monechi et al. (2012).
Distinguishing features: Cylindrical column that broadens distally and a wide, disc-like apical cycle that is crystallographically distinct.
Farinacci & Howe catalog pages: F. pileatus * , L. pileatus *
Search data:Tags | LITHS: nannolith-radiate, circular, cylindrical, CROSS-POLARS: V-prominent, R-prominent, |
Metrics | Lith size: 4->8µm; Data source notes: size (width) from illustrated specimens (OD size range of 5-12 µm not obviously supported) |
Geological Range:
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 (90% up, 61.7Ma, in Danian stage). Data source: Varol, 1989, fig. 12.4; Monechi et al. 2013, fig 6
Plot of occurrence data:
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 V O Bukry, D. (1973g). Phytoplankton stratigraphy, Deep Sea Drilling Project Leg 20, Western Pacific Ocean. Initial Reports of the Deep Sea Drilling Project. 20: 307-317. gs V O 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 Okada, H. & Thierstein, H. R. (1979). Calcareous nannoplankton - Leg 43, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 43: 507-573. gs V O 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 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 Varol, O. (1989c). Palaeocene calcareous nannofossil biostratigraphy. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series. 265-310. gs V OReferences:
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Lithoptychius pileatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-1-2021
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