Nannotax3 - ntax_Farinacci - Ravdotodiskolithos Nannotax3 - ntax_Farinacci - Ravdotodiskolithos

CATALOG - Ravdotodiskolithos


Folder trail: ntax_Farinacci -> R -> Ravdotodiskolithos
Folders this level: Radiodiscoaster, Radiolithus, Ramsaya, Ravdotodiskolithos, Rectapontis, Rectilius, Rectocorona, Reinhardtites, Repagulum, Retecapsa, Retecapsaceae, Retecapsoideae, Retemediaformis, Reticulofenestra, Reticulofenestraineae, Rhabdocyclus, Rhabdolekiskus, Rhabdolithina, Rhabdolithoideae> >>

Original descriptions of taxa - also emended descriptions for a few 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: Ravdotodiskolithos Varol 2025
Taxonomic rank: genus
Type species: Cyclicargolithus parvus Shamrock & Watkins 2012
Described on page(s) : 58

Combinations:
  • Ravdotodiskolithos Varol 2025 (basionym)

  • Original Description

    Diagnosis: Ravdotodiskolithos placoliths are characterized by two equal, distinctly striated distal and proximal shields of equal size. Prominent striations adorn the shields. Surrounding the very narrow central area is the tube cycle, which protrudes distally.

    Etymology:
    From the Greek ravdoto, striated, disko, disc, lithos, stone – refers to its striated shields.

    Extra details from original publication
    Optical properties: The shields of Ravdotodiskolithos exhibit first-order greyish-white interference colours, while the tube cycle produces first-order white interference colours. The species displays inclined dextrogyre extinction lines with angles of approximately 81° on the shield and 67° on the tube cycle on the distal side and shows length-fast (-) elongation.

    Remarks: The unique characteristics of Ravdotodiskolithos provide critical diagnostic criteria for differentiating it from other genera within the Noelaerhabdaceae family. These features include a distally protruding tube cycle and equal-sized non-concave-convex proximal and distal shields.

    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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    Ravdotodiskolithos: Catalog entry compiled by Jeremy Young. Viewed: 7-10-2026

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    Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=55802 Go to Archive.is to create a permanent copy of this page - citation notes

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