Tranolithus praeorionatus


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Tranolithus -> Tranolithus praeorionatus
Sister taxa: T. bitraversus, T. gabalus, T. incus, T. macleodiae, T. minimus, T. orionatus, T. praeorionatus, T. salillum, T. stemmerikii, T. sp.,

Distinguishing features: Medium sized (c. 5.0 µm) murolith coccolith with a transverse bar composed of four, short, triangular-shaped struts and a median granular section. The struts, which protrude from the inner rim edge, are conspicuous when the coccolith is orientated parallel to the polarising directions; the median part of the tranverse bar is only visible when the coccolith is rotated to 45°.


Taxonomy:

Citation: Tranolithus praeorionatus Bown in Kennedy et al., 2000
Rank: Species

Farinacci & Howe catalog pages: Tranolithus praeorionatus *

Distinguishing features: Medium sized (c. 5.0 µm) murolith coccolith with a transverse bar composed of four, short, triangular-shaped struts and a median granular section. The struts, which protrude from the inner rim edge, are conspicuous when the coccolith is orientated parallel to the polarising directions; the median part of the tranverse bar is only visible when the coccolith is rotated to 45°.


Size: Length 5.0-5.5 µm

Search data:
TagsLITHS: murolith, elliptical, CA: process, bar, V-UNITS: V-prominent, DETAILS: ca_disjunct, rim-unicyclic,
MetricsLith size: 4->6µm;
Sources: holotype +/-1µm
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Albian Substage (110.22-112.95Ma, top in Albian stage). Data source: Kennedy et al., 2000
First occurrence (base): within Late Aptian Substage (112.95-122.98Ma, base in Aptian stage). Data source: Kennedy et al., 2000

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Tranolithus

    References:

    Gale, A. S. et al. (2011). The uppermost Middle and Upper Albian succession at the Col de Palluel, Hautes-Alpes, France: An integrated study (ammonites, inoceramid bivalves, planktonic foraminifera, nannofossils, geochemistry, stable oxygen and carbon isotopes, cyclostratigraphy). Cretaceous Research. 32: 59-130. gs

    Kennedy, W. J. et al. (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pre _-Guittard, Arnayon (Drome), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research. 21: 591-720. gs


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    Tranolithus praeorionatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-3-2020

    Taxon Search:
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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11242 Go to Archive.is to create a permanent copy of this page - citation notes



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