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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Farinacci - Olladiscoaster exagonikoasteri.pdf
Varol & Bowman 2024 pl11 f01-24.jpg
Varol & Bowman 2024 pl12 f01-20.jpg
Varol & Bowman 2024 pl14 f01-20.jpg
Varol & Bowman 2024 pl13 f01-20.jpg
Varol & Bowman 2024 fig 7-17.JPG
Varol & Bowman 2024 fig 7-18.JPG
Current identification:
Compiled data
Citation: Olladiscoaster exagonikoasteri Varol & Bowman 2024Taxonomic rank: speciesType specimens: Holotype: Plate 11, Figs. 1-24 (same specimen in mobile mount). Type age (chronostrat): Zone NN5, Middle Miocene. Type locality: ODP Leg 154, Hole 926A (Ceara Rise), northern (equatorial) Atlantic Ocean, core 29H, section 5, 81-82 cm. Type repository: Varol Research, LlandudnoRepository Country: Wales
Original Description Hexagonal species of Olladiscoaster have segments without arms. On the distal side, the distinct sutural ridges are created by the deep cavities. The sutural ridges are almost aligned to the vertices of the species and are distinctly raised towards the centre and capped by boomerang-shaped distal covers. The distinct proximal ridges without a knob decorate the bulged proximal side. From the side view, Olladiscoaster exagonikoasteri resembles a child's top. Size: Dimensions of holotype: Maximum diameter: 7.07 µm, Maximum height: 5.08 µm (measurements from bright field micrograph). Etymology: From the Greek exagoniko asteri, a hexagonal star ? refers to its outline. Extra details from original publication Remarks:Olladiscoaster exagonikoasteri and Olladiscoaster perplexus have hexagonal outlines, and their sutural ridges are almost aligned with the vertices of the species. Olladiscoaster exagonikoasteri differs from Olladiscoaster perplexus by having a boomerang shape distal cover and lacking a proximal knob, whereas the latter has a kite shape distal cover and a hexagon-stellate proximal knob.
Occurrence: This species is recorded from ODP Leg 154, Hole 926A Cear? Rise and various commercial oil wells in the Gulf of Mexico.
Stratigraphic range: Middle Miocene (Zones NN5).
References:
Varol, O. & Bowman, A. R. (2024). The new Middle Miocene genus Olladiscoaster, and related and associated discoasters. Grzybowski Foundation Special Publication. 28: 1-102. gs
Olladiscoaster exagonikoasteri: Catalog entry compiled by Jeremy Young. Viewed: 5-3-2026