Tubodiscus
Classification: ntax_mesozoic -> Podorhabdales -> Tubodiscaceae -> Tubodiscus
Sister taxa: Manivitella, Tubodiscus
Distinguishing features: Tubodiscids with high and birefringent proximal collar cycle and wide central-area. Rim image is clearly bicyclic in XPL.
Daughter taxa (time control age-window is: 0-800Ma) |
 |  |  |  | Tubodiscus bellii
Medium sized (5-7 µm) with narrow shields / wide central area. In xpl the inner rim cycle is usually slightly narrower than the outer rim cycle
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 |  |  |  | Tubodiscus burnettiae
Medium to large (5-10 µm), typically broadly elliptical; the central area is broad (usually greater than the width of the rim). Inner and outer rim cycles of similar width.
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 |  |  |  | Tubodiscus frankiae
Medium sized (5-7 µm) with relatively broad shields/relatively narrow central area; in xpl inner rim cycle significantly narrower than the outer rim cycle.
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 |  |  |  | Tubodiscus jurapelagicus
Large (8-16 µm) with wide central area. Inner and outer rim cycles of similar width.
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 |  |  |  | Tubodiscus verenae
Large (8-16 µm) Tubodiscus with broad, high collar cycle that is highly birefringent (yellow-orange) in XPL; often seen in side view.
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 |  |  |  | Tubodiscus sp.
Specimens not identified to species level
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Taxonomy:
Citation: Tubodiscus Thierstein, 1973Rank: GenusType species: Tubodiscus verenae Thierstein, 1973.
Farinacci & Howe catalog pages: Tubodiscus *
Distinguishing features: Tubodiscids with high and birefringent proximal collar cycle and wide central-area. Rim image is clearly bicyclic in XPL.
Search data:
| Tags | LITHS: placolith, elliptical, CA: vacant, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
| Metrics | Lith size: 5->16µm;
Data source notes: size range of included species |
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range:
Last occurrence (top): at top of Albian Stage (100% up, 100.5Ma, in Albian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Berriasian Stage (0% up, 145Ma, in Berriasian stage). Data source: Total of range of species in this database
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Tubodiscaceae
References:
Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs
Thierstein, H. R. (1973). Lower cretaceous calcareous nannoplankton biostratigraphy. Abhandlungen der Geologischen Bundesanstalt. 29: 3-52. gs V O
