Reticulofenestra umbilicus


Ancestry: Coccolithophores -> Isochrysidales -> Noelaerhabdaceae -> Reticulofenestra -> R. umbilicus group -> Reticulofenestra umbilicus
Sister taxa: R. circus, R. circus var. lata, R. dictyoda, R. foveolata, R. hampdenensis, R. hesslandii, R. hillae, R. maceria Shafik 1989, R. macmillanii, R. moorei, R. oamaruensis, R. umbilicus, R. wadeae,

Short diagnosis: Very large (>14 µm) elliptical reticulofenestrids, with delicate proximal nets that cannot be resolved in light microscope or are missing.


Taxonomy:

Citation: Reticulofenestra umbilicus (Levin, 1965) Martini & Ritzkowski, 1968
Rank: Species
Basionym: Coccolithus umbilicus Levin, 1965

Farinacci & Howe catalog pages: Coccolithus umbilicus *

Short diagnosis: Very large (>14 µm) elliptical reticulofenestrids, with delicate proximal nets that cannot be resolved in light microscope or are missing.


Size: Holotype length 16.1µm.

Geological Range:
Last occurrence (top): at top of NP22 zone (100% up, 32Ma, in Rupelian stage). Data source: zonal marker (see Perch-Nielsen 1985)
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Perch-Nielsen 1985

Plot of occurrence data:

References:

Levin, H.L., (1965). Coccolithophoridae and related microfossils from the Yazoo Formation (Eocene) of Mississippi. Journal of Paleontology, 39(2): 265-272.

Martini, E. & Ritzkowski, S., (1968). Was ist das 'Unter-Oligozän'? Eine Analyse der Beyrich'schen und v Koenen'schen Fassung der Stufe mit Hilfe des fossilen Nannoplanktons. Nachr Akad Wiss Gottingen; II Mathematisch-Physikalische Klasse, 1968, 13: 231-250.

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.


Nannotax3 - Coccolithophores - Reticulofenestra umbilicus by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-3-2017

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Simun Ascic (Zagreb University, Croatia)
Description says <14µm. probably should be >14 µm
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Paul Bown (Univeristy College London, UK)
Well spotted! Just fixed it.
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