Nannotax3 - ntax_cenozoic - Toweius patellus Nannotax3 - ntax_cenozoic - Toweius patellus

Toweius patellus

Classification: ntax_cenozoic -> Isochrysidales -> Prinsiaceae -> Toweius -> Toweius patellus
Sister taxa: T. serotinus, T. pertusus, T. tovae, T. eminens, T. occultatus ⟩⟨ T. reticulum, T. selandianus, T. rotundus, T. patellus, T. callosus, T. magnicrassus, T. brusselensis ⟩⟨ T. gammation ⟩⟨ T. sp.


Citation: Toweius patellus Bown 2016
Rank: Species

Distinguishing features:
Parent taxon (Toweius): Elliptical to circular prinsiacean placoliths with central areas that are typically spanned by a proximal net and/or distal conjunct nets or bars. Typically medium sized.
This taxon: Medium sized; broadly elliptical to sib-circular; central area broad, spanned by a plate with perforations too small to resolve in LM.

Farinacci & Howe catalog pages: T. patellus *


Medium sized, broadly elliptical to subcircular Toweius with relatively wide central area (width similar to or slightly greater than the rim) spanned by weakly birefringent plate; no obvious perforations are apparent in LM. [Bown 2016]
Distinguished from other Toweius species by the relatively wide central area spanned by a plate with no clearly visible perforations in LM. [Bown 2016]

Search data:
LITHS: placolith, elliptical, CA: ca_conjunct, grill, vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 5->8µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP11 zone (53.7-54.17Ma, top in Ypresian stage). Data source: Bown 2016
First occurrence (base): within Np5 zone (59.54-61.51Ma, base in Selandian stage). Data source: Bown 2016

Plot of occurrence data:


Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs O

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


Toweius patellus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-11-2023

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Short stables page link: Go to to create a permanent copy of this page - citation notes

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