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:
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:
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]
LITHS: nannolith-radiate, circular, quadrate, CA: closed, CROSS-POLARS: T-prominent, |
Lith size: 4->7µm; Segments: 4->4; Data source notes: original description |
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:
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. gsReferences:
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Palaeomicula jacovidesii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-10-2023
Short stables 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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