Nannotax3 - ntax_Farinacci - Aubrysphaera

CATALOG - Aubrysphaera


Folder trail: ntax_Farinacci -> A -> Aubrysphaera
Folders this level: << < Ansulasphaera, Anthosphaera, Apertapetra, Apertius, Archaeopontosphaera, Archaeozygodiscus, Argyrosphaera, Arkhangelskiales, Arkhangelskiella, Aspidolithus, Aspidorhabdus, Assipetra, Asterolithes, Astrionis, Athenagalea, Aubrysphaera, Axopodorhabdus

Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was originally compiled by Prof A. Farinacci 1969-1989, since 2000 it has been updated and extended by Richard Howe - see also this page.
Taxa are sorted alphabetically for simple browsing, or you can use search boxes at the top & bottom of the page


Aubrysphaera deconinckii Steurbaut 1990



Current identification:

Compiled data

Citation: Aubrysphaera Steurbaut 1990
Rank: genus
Type species: Aubrysphaera deconinckii Steurbaut 1990
Farinacci catalog page (& compiler): 26001
Language: EN


Original Description
This genus is introduced for dome-shaped, porous nannoliths, consisting of a hollow construction of bifurcating ribs, which in certain orientations show high birefringence in cross- polarised light.

Etymology: In honour of Dr. M.-P. AUBRY (Lyon, France), author of the "Handbook of Cenozoic Calcareous Nannoplankton".

Extra details from original publication
Remarks. - Aubrysphaera differs from other holococcolithid genera by its typical dome-shaped outline and by its hollow construction, which, in certain orientations, show high birefringence under crossed nicols. There is a certain similarity of shape and construction between this genus and Trochoaster KLUMPP, 1953. The latter, however never exhibits birefringence under crossed nicols (see AUBRY, 1988,p. IV). This difference in optical behaviour cannot be due to secondary calcification because representatives of Trochoaster which show no birefringence (e.g. T. operosus) are also found in the same samples and slides. Aubrysphaera also seems to be related to the genus Dactylethra GARTNER, 1969. The type species of this monospecific genus D. punctulata GARTNER, 1969, however, has a solid construction with a completely enclosed centre which is filled with calcite (see GARTNER & BUKRY, 1969, p. 1219). It also seems to be formed of several crystals of calcite, which act differently in cross-polarised light, some of them showing maximum and others minimum birefringence.

Only one species is known, the type species Aubrysphaera deconinckii. It is recorded from various exposures and boreholes in the Ypresian of the Belgian Basin.

References:

Steurbaut, E. (1990). Ypresian calcareous nannoplankton biostratigraphy and palaeogeography of the Belgian Basin. Bulletin de la Société Belge de Géologie. 97(1988): 251-285. gs


nannotaxlogo400px

Aubrysphaera: Catalog entry compiled by Richard Howe. Viewed: 18-10-2021

Taxon Search:
Advanced Search
Link to WoRMS (World Register of Marine Species)

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics