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

Toweius reticulum


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

Taxonomy:

Citation: Toweius reticulum Bown 2016
taxonomic rank: Species

Distinguishing features:
Parent taxon (Toweius): Typically medium-sized.(5-8 µm), elliptical to circular, central areas typically with a conjunct net and/or bars.
This taxon: Very small (2-3µm); narrowly elliptical; central area wide, spanned by radial bars.

Farinacci & Howe catalog pages: T. reticulum *


Morphology:

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:

References:

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


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Toweius reticulum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-6-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1421 Go to Archive.is to create a permanent copy of this page - citation notes
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