Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Farinacci & Howe 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 The Farinacci and Howe Catalog - an Introduction.
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Citation: Tubodiscaceae Bown & Rutledge in Young & Bown 1997taxonomic rank: FamilyType species: Tubodiscus Thierstein, 1973.Farinacci catalog page (& compiler): n/a Current citation: Tubodiscaceae Bown & Rutledge, 1997 in Bown & Young, 1997
Original Description Elliptical placoliths composed of two narrow shields and a third, narrow, proximally-situated collar-cycle which 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. Element curvature is dextrogyre in the distal shield and suture obliquity is broadly dextral (clockwise). In the proximal shield these orientations are the same when viewed proximally. Suture curvature in the collar-cycle is laevogyre when viewed proximally; element imbrication is anticlockwise (for T. verenae). The crystallography of these coccoliths has not yet been determined.
References:
Young, J. R. & Bown, P. R. (1997). Higher classification of calcareous nannofossils. Journal of Nannoplankton Research. 19(1): 15-20. gsO
Tubodiscaceae: Catalog entry compiled by Jeremy Young. Viewed: 15-10-2024