Nannotax3 - ntax_mesozoic

Tubodiscaceae

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

Distinguishing features: 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: (blue => in age window 0-800Ma)		Granddaughter taxa
	Manivitella Tubodiscids with low proximal collar cycle and wide central-area.	M. pemmatoidea M. sp.
	Tubodiscus Tubodiscids with high and birefringent proximal collar cycle and wide central-area. Rim image is clearly bicyclic in XPL.	T. bellii T. burnettiae T. frankiae T. jurapelagicus T. verenae T. sp.

Taxonomy:

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

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:

Tags	LITHS: placolith,
Metrics	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 Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Tithonian Stage (62% up, 147.7Ma, in Tithonian 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. 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 V O

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

Tubodiscaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-1-2021

Taxon Search:

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

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