Nannotax3 - ntax_mesozoic - Palaeomicula jacovidesii

Palaeomicula jacovidesii


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Palaeomicula -> Palaeomicula jacovidesii
Sister taxa: P. jacovidesii, P. maltica, P. quadrisphena

Distinguishing features:
Parent taxon (Palaeomicula): Nannolith formed of four blocks, nannolith shape is approx square with diagonal sutures, elements show tangential crystallographic orientations
This taxon: Medium-sized (4.0–7.0 μm) circular species with four imbricated, triangular, segments positioned along the sinusoidal sutures.


Taxonomy:

Citation: Palaeomicula jacovidesii Varol & Bowman 2019
Rank: Species

Farinacci & Howe catalog pages: P. jacovidesii [no catalog entry yet]

Distinguishing features:
Parent taxon (Palaeomicula): Nannolith formed of four blocks, nannolith shape is approx square with diagonal sutures, elements show tangential crystallographic orientations
This taxon: Medium-sized (4.0–7.0 μm) circular species with four imbricated, triangular, segments positioned along the sinusoidal sutures.


Morphology:

Paleomicula jacovidesii is a circular nannolith having four smooth imbricated and triangular segments and distinct sinusoidal sutures. The thick imbricated edges of the segments along the sinusoidal sutures can be clearly observed.
It is easily distinguished from the other species of Paleomicula by being circular and having sinusoidal sutures and imbricated triangular segments. Tetralithus quadrisphenus and Palaeomicula maltica have quadrate outlines with wedge-shaped segments. [Varol & Bowman 2019] 

Size:

Search data:
LITHS: nannolith-radiate, circular, quadrate, CA: closed, CROSS-POLARS: T-prominent,
Lith size: 4->7µm; Segments: 4->4;
Data source notes: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Late Tithonian Substage (145.01-147.72Ma, top in Tithonian stage). Data source: Varol & Bowman 2019
First occurrence (base): within Late Tithonian Substage (145.01-147.72Ma, base in Tithonian stage). Data source: Varol & Bowman 2019

Plot of occurrence data:

References:

Varol, O. & Bowman, A. R. (2019). Taxonomic revision of selected Late Jurassic (Tithonian) calcareous nannofossils and the application of mobile mounting. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291: 65-87. gs


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Palaeomicula jacovidesii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-9-2022

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11370 Go to Archive.is to create a permanent copy of this page - citation notes



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