Nannotax3 - ntax_Farinacci - Asynithistostoichos Nannotax3 - ntax_Farinacci - Asynithistostoichos

CATALOG - Asynithistostoichos


Folder trail: ntax_Farinacci -> A -> Asynithistostoichos
Folders this level: << < Apertius, Archaeopontosphaera, Archaeozygodiscus, Argyrosphaera, Arkhangelskiales, Arkhangelskiella, Arkhangelskiellaceae, Arkhangelskielleae, Arkhangelskielloideae, Asinithistimorfi, Aspidolithus, Aspidorhabdus, Assipetra, Asterolithes, Astrionis, Asynithistostoichos, Athenagalea, Aubrysphaera, Axopodorhabdaceae, Axopodorhabdus

Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Farinacci & Howe Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was originally compiled by Prof A. Farinacci 1969-1989, since 2000 it has been updated and extended by Richard Howe - see The Farinacci and Howe Catalog - an Introduction.
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Current identification:

Compiled data

Citation:

Asynithistostoichos Varol 2025

Taxonomic rank: genus
Type species: Gartnerago coxalliae Lees, 2007
Described on page(s) : 64


Original Description

Diagnosis: The loxolith calcareous nannofossils consist of a single wall and a central area with a yoke cycle, creating a bifurcating transverse bar with large pores on both sides. The transverse bar supports a distal process.


Etymology:
From the Greek Asynithistos toichos, the unusual wall – refers to its bright outer wall.

Extra details from original publication

Optical properties: in the plan view, the wall displays first-order white interference colours, inclined extinction lines and a length-fast (-) elongation. The yoke cycle exhibits first-order whitish-grey interference colours and inclined extinction lines. The distal process shows length-slow (+) elongation in the side view.

Remarks: The assignment of Asynithistostoichos to the family Ahmuellerallaceae is questionable due to its single-wall structure displaying interference colours, which are distinctive optical properties. These unique structural and optical characteristics are critical for differentiating Asynithistostoichos from other taxa within the same family. The Ahmuellerallaceae exhibits a single wall with an optical axis perpendicular relative to the microscope stage; therefore, it is in constant extinction (dim).

References:

Varol, O. (2025). A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222. gs


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Asynithistostoichos: Catalog entry compiled by Jeremy Young. Viewed: 16-6-2026

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=55791 Go to Archive.is to create a permanent copy of this page - citation notes

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