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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Original Description Diagnosis: Nannoliths with rhombic and triradiate mor- phologies, and non-birefringent images in XPL. Incorporating the genera Rhomboaster and Tribrachiatus. Extra details from original publication Remarks: Rhomboaster and Tribrachiatus nannoliths comprise an evolutionary lineage from the oldest, rhom- bic nannoliths (cuspis-type), through intermediate forms with two superimposed triradiate cycles (bramlettei- type), to the youngest, single-cycled triradiate forms (orthostylus-type). Bybell & Self-Trail (1995, 1997) argued for the use of one genus only, whereas others have retained both (e.g. Aubry, 1996). Both genera are used here: Rhomboaster for nannoliths with three-dimensional, rhombic to bicyclic, triradiate morphologies, and Tribrachiatus for flatter morphologies with a single triradiate cycle.
References:
Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gsO
Rhomboasteraceae: Catalog entry compiled by <% compiler %>. Viewed: 10-11-2024