Lithoptychius pileatus


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

Short diagnosis: Cylindrical column that broadens distally and a wide, disc-like apical cycle that is crystallographically distinct.


Taxonomy:

Citation: Lithoptychius pileatus (Bukry, 1973) Aubry in Aubry et al. 2011
Rank: Species
Basionym: Fasciculithus pileatus Bukry, 1973
Notes & discussion: Distinguishing this taxon from L. janii is quite straightforward, but it is clearly similar and may prove to be conspecific.
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).

Farinacci & Howe catalog pages: Fasciculithus pileatus * Lithoptychius pileatus *

Short diagnosis: Cylindrical column that broadens distally and a wide, disc-like apical cycle that is crystallographically distinct.

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:

References:

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

Bukry, D., (1973). Phytoplankton stratigraphy, Deep Sea Drilling Project Leg 20, Western Pacific Ocean. Initial Reports of the Deep Sea Drilling Project, 20: 307-317.

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.

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

Perch-Nielsen, K., (1985). Cenozoic calcareous nannofossils. In: Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (Editors), Plankton Stratigraphy. Cambridge University Press, Cambridge, pp. 427-555.

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


Nannotax3 - Coccolithophores - Lithoptychius pileatus by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-6-2017

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Vladimir Musatov (Saratov, Russia)

Hi Jeremy

Lithoptychius pileatus

Last occurrence (top): in mid part of NP6 zone.

In the zonal division scheme indicated by its disappearance in the middle zone NP5. (http://mikrotax.org/Nannotax3/graphics/nanno-zonations1.svg.

The truth is out there))

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Jeremy Young

Hi Vladimir

Interesting observation. The mid NP6 LAD quoted here is bsed on Varol (1998) who used the LAD of F. pileatus within his zonal scheme. However, the taxon is certiainly more common in top NP4-lower NP5. A possible explanation is provided by Agnini et al. 2007 (fig. 5) who show an LCO in mid NP5 but a trail of rare occurrences up into NP6 . I am not sure where the mid NP5 LAD in time scale creator comes from. What is your experience?

Jeremy

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