Nannotax3 - ntax_Farinacci - Mikriexoterikiaspida Nannotax3 - ntax_Farinacci - Mikriexoterikiaspida

CATALOG - Mikriexoterikiaspida


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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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Mikriexoterikiaspida fionajacovidesiae Varol 2025



Current identification:

Compiled data

Citation: Mikriexoterikiaspida Varol 2025
Taxonomic rank: genus
Type species: Mikriexoterikiaspida fionajacovidesiae Varol, 2025
Described on page(s) : 53

Combinations:
  • Mikriexoterikiaspida Varol 2025 (basionym)

  • Original Description

    Diagnosis: Circular to elliptical placolith consists of single-tiered distal and broader proximal shields and a double tube cycle gently protruding distally. Except for the outer tube cycle, all components exhibit inclined extinction lines and length-fast (-) elongation. The outer tube cycle shows constant extinction because the optic is vertical relative to the microscope stage in the plan view. The extinction lines are dextrogyre on the distal side, and their typical angle is about 73° on the distal shield and 48° on the tube cycle.

    Etymology:
    From the Greek mikriexoterikiaspida, the small outer shield – refers to its narrower distal shield.

    Extra details from original publication
    Optical properties:

    Remarks: Mikriexoterikiaspida differs from Cyclagelosphaera, Watznaueria, and Ellipsagelosphaera because it has a narrower distal shield.

    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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    Mikriexoterikiaspida: Catalog entry compiled by Jeremy Young. Viewed: 5-10-2026

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    Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=55800 Go to Archive.is to create a permanent copy of this page - citation notes

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