Nannotax3 - ntax_cenozoic - Toweius reticulum Nannotax3 - ntax_cenozoic - Toweius reticulum

Toweius reticulum

Classification: ntax_cenozoic -> Isochrysidales -> Prinsiaceae -> Toweius -> Toweius reticulum
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 reticulum 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: Very small (2-3µm); narrowly elliptical; central area wide, spanned by radial bars.

Farinacci & Howe catalog pages: T. reticulum *


Very small Toweius (1.8–3.0μm) with relatively wide central area (width similar to or slightly greater than the rim) spanned by a grill formed from radial bars that merge to form a central longitudinal bar or plate, which may be perforate. [Bown 2016]
This species has not been unambiguously identified in LM due to its small size, but is likely one of the taxa commonly informally grouped as small Toweius. [Bown 2016]
Distinguished from other Toweius by the small size and central area grill predominantly composed of radial, lath-like bars. Somewhat similar to Eocene specimens described as Cyathosphaera martinii Hay & Towe, 1962, but T. reticulum has thicker central area bars and a central longitudinal structure with pores. In addition, the generic affinity of C. martini is uncertain and it may be a small reticulofenestrid. [Bown 2016]

Search data:
LITHS: placolith, elliptical, CA: ca_conjunct, grill,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 2->3µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP6 zone (58.97-59.54Ma, top in Thanetian stage). Data source: Bown 2016
First occurrence (base): within NP6 zone (58.97-59.54Ma, base in Selandian stage). Data source: Bown 2016

Plot of occurrence data:


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

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