Nannotax3 - ntax_cenozoic - Trochoaster tripartitus Nannotax3 - ntax_cenozoic - Trochoaster tripartitus

Trochoaster tripartitus


Classification: ntax_cenozoic -> Nannolith families inc sed -> Lithostromationaceae -> Lithostromation -> Trochoaster tripartitus
Sister taxa: L. hohnensis, L. pyramidale, T. tripartitus ⟩⟨ L. martinii, L. nodosum, L. obscurum, L. reginum ⟩⟨ L. operosum, L. perdurum, L. simplex, L. biconvexitas, L. sp.

Taxonomy:

Citation: Trochoaster tripartitus Martini 1988
Taxonomic rank: species
Taxonomic discussion: For consistency this species should be recombined into Lithostromation [my interpretation - JRY 2025]

Distinguishing features:
Parent taxon (Lithostromation): Triangular to stellate nannoliths with porous structure formed from small crystallites. All show 3-fold symetry but with a wide range of forms.
This taxon: 3 co-planar broad, bifurcate rays, large size (12-22 µm)

Farinacci & Howe catalog pages: T. tripartitus *


Size:
12 -22 µm

Search data:
Lith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Oligocene Sub-Epoch (28.09-33.89Ma, top in Rupelian stage). Data source: Martini 1988
First occurrence (base): within Early Oligocene Sub-Epoch (28.09-33.89Ma, base in Rupelian stage). Data source: Martini 1988

Plot of occurrence data:

References:

Martini, E. (1988). Nannoplankton-Massenvorkommen in den Corbicula-(=Schichten mit Hydrobia inflata) und Hydrobienschichten des Oberrheingrabens, des Mainzer und des Hanauer Beckens (Miozän). Geologisches Jahrbuch. A110: 205-227. gs

Martini, E. (1998). A new stratigraphically important Trochoaster species (nannoplankton) of the Middle Pechelbronn Formation (Lower Oligocene). Mainzer naturwissenschaftliches Archiv-Beheft. 104: 165-172. gs


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Trochoaster tripartitus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-5-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1844 Go to Archive.is to create a permanent copy of this page - citation notes
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