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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Current identification/main database link: Olladiscoaster Varol & Bowman 2024
Compiled data
Original Description
Description: Distinct sutural ridges, distal cover, and deep cavities ornament the distal side of all Olladiscoaster species. Prominent ridges run along the segments on the proximal side, and they may develop a platform-like structure over the proximally bulged central area. The ridges may produce a hexagon-stellate, petaloid or radiating proximal knob in the middle of the central area. A species consists of five to six segments with quasi-arms or no arms. At the plan view, Olladiscoaster is non-birefringent, but at the side view, it is strongly birefringent with a tangential c-axis. According to the characteristics of the segments, we recognised two groups of Olladiscoaster (Figures 7-8).
Etymology:
Extra details from original publication
The taxonomic problems existing within the olladiscoasters are primarily caused by typically settling randomly in side-view or plan-view due to the similar height-width ratio. Many species of olladiscoasters display noticeable taxonomic differences and may appear superficially similar in particular views. We applied the mobile mount technique on all samples and successfully mapped the different profiles of all olladiscoasters. Based on our rigorous experience, we strongly recommend utilising the mobile mount technique while examining Middle to Late Miocene samples. However, all the species cited in this study may be easily identified with the help of Figures 4, 7-9.
Olladiscoaster bordii group:
This group has segments without free-lengths, a circular or hex- agonal outline, and a kite or boomerang-shaped distal cover (Figure 7).
Species included: O. cruzii, O. exagonikoasteri, O. perplexus, O. zucchiae
Olladiscoaster molae group:
This group has segments with quasi-arms, a stellate outline, and a kite or boomerang-shaped distal cover (Figure 8). Species included: O. cruxii, O. lepidus, O. molae, O. superbus, O. tokerae, O. vestigium
References:
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Olladiscoaster: Catalog entry compiled by Jeremy Young. Viewed: 12-2-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=55749 Go to Archive.is to create a permanent copy of this page - citation notes |