Olladiscoaster exagonikoasteri
Set number: 1805
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10µm
Holotype in the mobile mount.
Set number: 2495
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10µm
In the mobile mount
Set number: 2797
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10µm
In the mobile mount
Olladiscoaster exagonikoasteri Varol & Bowman, 2024
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.
From the Greek exagoniko asteri, a hexagonal star – refers to its outline.
Maximum diameter: 7.07 µm, Maximum height: 5.08 µm (measurements from bright field micro-graph).
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.
Varol, O. & Bowman, A. R. 2024. The New Middle Miocene Genus Olladiscoaster, and Related and Associated Discoasters. Grzybowski Foundation Special Publication, 28: 1-103 pp.
Holotype
Olladiscoaster exagonikoasteri
Varol & Bowman, 2024
Middle Miocene
ODP Leg 154, Hole 926A, Ceará Rise, western equatorial Atlantic.