Nannotax3 - ntax_mesozoic

Nannotax3 - ntax_mesozoic - Tubodiscaceae Nannotax3 - ntax_mesozoic - Tubodiscaceae

Tubodiscaceae

Classification: ntax_mesozoic -> Podorhabdales -> Tubodiscaceae
Sister taxa: Axopodorhabdaceae, Biscutaceae, Calyculaceae, Cretarhabdaceae, Mazaganellaceae, Prediscosphaeraceae, Tubodiscaceae

Distinguishing features:
Parent taxon (Podorhabdales): Placolith (or modified placolith) coccoliths showing little or no imbrication. Typically, V-units form distal shield, R-units form proximal shield.
This taxon: Elliptical placoliths composed of two narrow shields and a third, narrow, proximally-situated collar cycle that is variable in height. The central-area is broad and open; no central structures have yet been observed. The LM image is dark, although the collar cycle is brighter.

Daughter taxa (time control age-window is: 0-800Ma)		Granddaughter taxa
	Manivitella Tubodiscids with low proximal collar cycle and wide central-area.	Manivitella fibrosa Manivitella pemmatoidea Manivitella sp.
	Tubodiscus Tubodiscids with high and birefringent proximal collar cycle and wide central-area. Rim image is clearly bicyclic in XPL.	Tubodiscus bellii Tubodiscus burnettiae Tubodiscus frankiae Tubodiscus jurapelagicus Tubodiscus verenae Tubodiscus sp.

Taxonomy:

Citation: Tubodiscaceae Bown & Rutledge, 1997 in Bown & Young, 1997

taxonomic rank: Family

Type species: Tubodiscus Thierstein, 1973.

Farinacci & Howe catalog pages: Tubodiscaceae *

Morphology:

Elliptical placoliths composed of two narrow shields and a third, narrow, proximally-situated collar cycle that is variable in height. The central-area is broad and open; no central structures have yet been observed. The LM image is dark, although the collar cycle is brighter.
Manivitella and Tubodiscus have similar rim structures but differ in the elevation of the proximal collar cycle, which is low in Manivitella and higher in Tubodiscus. The 'high-collared' forms appear distinct in the LM, as the increased height of the cycle produces high birefringence colours.

Search data:

: placolith,

Lith size: 0->0µm;

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 Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Late Tithonian Substage (143.10-145.00Ma, base in Tithonian stage). Data source: Total of ranges 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. For the customisable plot option go to a genus page Parent: Podorhabdales

References:

Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O

Thierstein, H. R. (1973). Lower cretaceous calcareous nannoplankton biostratigraphy. Abhandlungen der Geologischen Bundesanstalt. 29: 3-52. gs

Tubodiscaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-10-2024

Taxon Search:

Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11271 Go to Archive.is to create a permanent copy of this page - citation notes

Nannotax is being sponsored through 2024 by Woodside Energy and Shell USA